diff --git a/app/src/main/java/org/sopt/sample/SignInActivity.kt b/app/src/main/java/org/sopt/sample/SignInActivity.kt
index e59aea1..7caba5e 100644
--- a/app/src/main/java/org/sopt/sample/SignInActivity.kt
+++ b/app/src/main/java/org/sopt/sample/SignInActivity.kt
@@ -2,6 +2,7 @@ package org.sopt.sample
 
 import android.content.Intent
 import android.os.Bundle
+import android.widget.Toast
 import androidx.activity.viewModels
 import org.sopt.sample.base.BindingActivity
 import org.sopt.sample.databinding.ActivitySignInBinding
@@ -22,6 +23,7 @@ class SignInActivity: BindingActivity<ActivitySignInBinding>(R.layout.activity_s
         }
 
         viewModel.loginResult.observe(this) {
+            Toast.makeText(this, getString(R.string.sign_in_success_toast_msg), Toast.LENGTH_LONG).show()
             startActivity(Intent(this, MainActivity::class.java))
         }
         binding.registerBtn.setOnClickListener(){
diff --git a/app/src/main/java/org/sopt/sample/SignUpActivity.kt b/app/src/main/java/org/sopt/sample/SignUpActivity.kt
index 877ecdd..051de8c 100644
--- a/app/src/main/java/org/sopt/sample/SignUpActivity.kt
+++ b/app/src/main/java/org/sopt/sample/SignUpActivity.kt
@@ -5,6 +5,7 @@ import android.os.Bundle
 import android.text.Editable
 import android.text.TextWatcher
 import android.view.View
+import android.widget.Toast
 import androidx.activity.viewModels
 import androidx.core.content.ContextCompat
 import org.sopt.sample.base.BindingActivity
@@ -100,6 +101,7 @@ class SignUpActivity : BindingActivity<ActivitySignUpBinding>(R.layout.activity_
 
         viewModel.signupResult.observe(this) {
             startActivity(Intent(this,SignInActivity::class.java))
+            Toast.makeText(this,getString(R.string.sign_up_success_toast_msg), Toast.LENGTH_LONG).show()
         }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/org/sopt/sample/adapter/RepoViewHolder.kt b/app/src/main/java/org/sopt/sample/adapter/RepoViewHolder.kt
index 6ee5dfa..f8d5a2b 100644
--- a/app/src/main/java/org/sopt/sample/adapter/RepoViewHolder.kt
+++ b/app/src/main/java/org/sopt/sample/adapter/RepoViewHolder.kt
@@ -10,7 +10,7 @@ class RepoViewHolder(
 ): RecyclerView.ViewHolder(binding.root){
     fun onBind(data: ResponseUserDTO.Data){
         binding.imgGithub.load(data.avatar)
-        binding.txtGithubName.setText(data.first_name)
+        binding.txtGithubName.setText(data.firstName)
         binding.txtGithubAuthor.setText(data.email)
     }
 
diff --git a/app/src/main/java/org/sopt/sample/login/LoginViewModel.kt b/app/src/main/java/org/sopt/sample/login/LoginViewModel.kt
index 5346aa0..23f1ae7 100644
--- a/app/src/main/java/org/sopt/sample/login/LoginViewModel.kt
+++ b/app/src/main/java/org/sopt/sample/login/LoginViewModel.kt
@@ -1,6 +1,7 @@
 package org.sopt.sample.login
 
 import android.util.Log
+import android.widget.Toast
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
@@ -9,7 +10,7 @@ import retrofit2.Call
 import retrofit2.Callback
 import retrofit2.Response
 
-class LoginViewModel: ViewModel() {
+class LoginViewModel : ViewModel() {
     private val _loginResult: MutableLiveData<ResponseLoginDTO> = MutableLiveData()
     val loginResult: LiveData<ResponseLoginDTO>
         get() = _loginResult
@@ -22,7 +23,6 @@ class LoginViewModel: ViewModel() {
                 call: Call<ResponseLoginDTO>,
                 response: Response<ResponseLoginDTO>
             ) {
-                Log.d("로그인 성공", "${response.body()}")
                 _loginResult.value = response.body()
             }
 
diff --git a/app/src/main/java/org/sopt/sample/remote/ResponseUserDTO.kt b/app/src/main/java/org/sopt/sample/remote/ResponseUserDTO.kt
index 43a835e..08f4f46 100644
--- a/app/src/main/java/org/sopt/sample/remote/ResponseUserDTO.kt
+++ b/app/src/main/java/org/sopt/sample/remote/ResponseUserDTO.kt
@@ -1,5 +1,6 @@
 package org.sopt.sample.remote
 
+import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
 @Serializable
@@ -7,7 +8,8 @@ data class ResponseUserDTO(
     val page: Int,
     val per_page: Int,
     val total: Int,
-    val total_pages: Int,
+    @SerialName("total_pages")
+    val totalPages: Int,
     val data: List<Data>,
     val support: Support,
 
@@ -16,8 +18,10 @@ data class ResponseUserDTO(
     data class Data(
         val id: Int,
         val email: String,
-        val first_name: String,
-        val last_name: String,
+        @SerialName("first_name")
+        val firstName: String,
+        @SerialName("last_name")
+        val lastName: String,
         val avatar: String,
     )
 
diff --git a/app/src/main/java/org/sopt/sample/signup/SignupViewModel.kt b/app/src/main/java/org/sopt/sample/signup/SignupViewModel.kt
index a996d15..d5a9cbc 100644
--- a/app/src/main/java/org/sopt/sample/signup/SignupViewModel.kt
+++ b/app/src/main/java/org/sopt/sample/signup/SignupViewModel.kt
@@ -33,11 +33,10 @@ class SignupViewModel: ViewModel() {
                 response: Response<ResponseSignupDTO>
             ) {
                 _signupResult.value = response.body()
-                Log.d("회원가입 성공", "${response.body()}")
             }
 
             override fun onFailure(call: Call<ResponseSignupDTO>, t: Throwable) {
-                TODO("Not yet implemented")
+
             }
         })
 
diff --git a/app/src/main/res/layout/activity_sign_in.xml b/app/src/main/res/layout/activity_sign_in.xml
index 770e6c6..4047ccb 100644
--- a/app/src/main/res/layout/activity_sign_in.xml
+++ b/app/src/main/res/layout/activity_sign_in.xml
@@ -22,7 +22,7 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginTop="60dp"
-            android:text="Welcome to SOPT"
+            android:text="@string/sign_in_title"
             android:textSize="20sp"
             android:textStyle="bold"
             app:layout_constraintEnd_toEndOf="parent"
@@ -35,7 +35,7 @@
             android:layout_height="wrap_content"
             android:layout_marginStart="40dp"
             android:layout_marginTop="32dp"
-            android:text="ID"
+            android:text="@string/sign_id_label"
             android:textStyle="bold"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/txt_title" />
@@ -46,7 +46,7 @@
             android:layout_height="wrap_content"
             android:layout_marginHorizontal="40dp"
             android:layout_marginTop="20dp"
-            android:hint="아이디를 입력하세요"
+            android:hint="@string/sign_id_hint"
             app:layout_constraintTop_toBottomOf="@+id/txt_id_title"
             tools:layout_editor_absoluteX="40dp" />
 
@@ -56,7 +56,7 @@
             android:layout_height="wrap_content"
             android:layout_marginStart="40dp"
             android:layout_marginTop="32dp"
-            android:text="비밀번호"
+            android:text="@string/sign_pw_label"
             android:textStyle="bold"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/editText_id" />
@@ -67,7 +67,7 @@
             android:layout_height="wrap_content"
             android:layout_marginHorizontal="40dp"
             android:layout_marginTop="20dp"
-            android:hint="비밀번호를 입력하세요"
+            android:hint="@string/sign_pw_hint"
             android:inputType="textPassword"
             app:layout_constraintTop_toBottomOf="@+id/txt_password_title" />
 
@@ -77,7 +77,7 @@
             android:layout_height="wrap_content"
             android:layout_marginHorizontal="40dp"
             android:layout_marginTop="30dp"
-            android:text="LOGIN"
+            android:text="@string/sign_in"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/editText_pw" />
@@ -87,7 +87,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_marginHorizontal="40dp"
-            android:text="SIGNUP"
+            android:text="@string/sign_up"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/loginBtn" />
diff --git a/app/src/main/res/layout/activity_sign_up.xml b/app/src/main/res/layout/activity_sign_up.xml
index 7b57cc7..dda9d05 100644
--- a/app/src/main/res/layout/activity_sign_up.xml
+++ b/app/src/main/res/layout/activity_sign_up.xml
@@ -21,7 +21,7 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginTop="60dp"
-            android:text="SIGNUP"
+            android:text="@string/sign_up_title"
             android:textSize="20sp"
             android:textStyle="bold"
             app:layout_constraintEnd_toEndOf="parent"
@@ -34,7 +34,7 @@
             android:layout_height="wrap_content"
             android:layout_marginStart="40dp"
             android:layout_marginTop="32dp"
-            android:text="이메일"
+            android:text="@string/sign_up_email_label"
             android:textStyle="bold"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/txt_title" />
@@ -45,7 +45,7 @@
             android:layout_height="wrap_content"
             android:layout_marginHorizontal="40dp"
             android:layout_marginTop="20dp"
-            android:hint="이메일을 입력하세요"
+            android:hint="@string/sign_up_email_hint"
             app:layout_constraintTop_toBottomOf="@+id/txt_email_title"
             tools:layout_editor_absoluteX="40dp" />
 
@@ -54,8 +54,8 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginEnd="40dp"
-            android:text="이메일 형식이 올바르지 않습니다."
-            android:textColor="#ff0000"
+            android:text="@string/sign_up_email_error"
+            android:textColor="@color/red"
             android:visibility="invisible"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/editText_email" />
@@ -66,7 +66,7 @@
             android:layout_height="wrap_content"
             android:layout_marginStart="40dp"
             android:layout_marginTop="32dp"
-            android:text="비밀번호"
+            android:text="@string/sign_up_pw_label"
             android:textStyle="bold"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/editText_email" />
@@ -77,7 +77,7 @@
             android:layout_height="wrap_content"
             android:layout_marginHorizontal="40dp"
             android:layout_marginTop="20dp"
-            android:hint="비밀번호를 입력하세요"
+            android:hint="@string/sign_up_pw_hint"
             app:layout_constraintTop_toBottomOf="@+id/txt_password_title" />
 
         <TextView
@@ -85,8 +85,8 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginEnd="40dp"
-            android:text="비밀번호 형식이 올바르지 않습니다."
-            android:textColor="#ff0000"
+            android:text="@string/sign_up_pw_error"
+            android:textColor="@color/red"
             android:visibility="invisible"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/editText_pw" />
@@ -97,7 +97,7 @@
             android:layout_height="wrap_content"
             android:layout_marginStart="40dp"
             android:layout_marginTop="32dp"
-            android:text="이름"
+            android:text="@string/sign_up_name_label"
             android:textStyle="bold"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/editText_pw" />
@@ -109,7 +109,7 @@
             android:layout_height="wrap_content"
             android:layout_marginHorizontal="40dp"
             android:layout_marginTop="20dp"
-            android:hint="이름을 입력하세요"
+            android:hint="@string/sign_up_name_hint"
             app:layout_constraintTop_toBottomOf="@+id/txt_name_title" />
 
         <Button
@@ -119,7 +119,7 @@
             android:layout_marginHorizontal="40dp"
             android:layout_marginTop="30dp"
             android:enabled="false"
-            android:text="회원가입 완료"
+            android:text="@string/sign_up_finish"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/editText_name" />
diff --git a/app/src/main/res/layout/fragment_gallery.xml b/app/src/main/res/layout/fragment_gallery.xml
index f762e57..579dd54 100644
--- a/app/src/main/res/layout/fragment_gallery.xml
+++ b/app/src/main/res/layout/fragment_gallery.xml
@@ -24,7 +24,7 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginTop="100dp"
-            android:text="이미지 업로드!"
+            android:text="@string/gallery_image_upload"
             app:layout_constraintEnd_toEndOf="@+id/iv_sample"
             app:layout_constraintStart_toStartOf="@+id/iv_sample"
             app:layout_constraintTop_toBottomOf="@+id/iv_sample" />
diff --git a/app/src/main/res/layout/fragment_search.xml b/app/src/main/res/layout/fragment_search.xml
index 92ef1ca..dc81c56 100644
--- a/app/src/main/res/layout/fragment_search.xml
+++ b/app/src/main/res/layout/fragment_search.xml
@@ -11,7 +11,6 @@
         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:text="여기는 search fragment 입니다!"
             android:textSize="20sp"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toEndOf="parent"
diff --git a/app/src/main/res/layout/layout_github_repo.xml b/app/src/main/res/layout/layout_github_repo.xml
index 8b8f6c6..a8ec344 100644
--- a/app/src/main/res/layout/layout_github_repo.xml
+++ b/app/src/main/res/layout/layout_github_repo.xml
@@ -23,7 +23,7 @@
         app:layout_constraintBottom_toTopOf="@+id/txt_github_author"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toTopOf="@+id/img_github"
-        tools:text="Repo Name" />
+        tools:text="@string/github_repo" />
 
     <TextView
         android:id="@+id/txt_github_author"
@@ -32,7 +32,7 @@
         app:layout_constraintBottom_toBottomOf="@+id/img_github"
         app:layout_constraintEnd_toEndOf="@+id/txt_github_name"
         app:layout_constraintTop_toBottomOf="@+id/txt_github_name"
-        tools:text="Dani Lee" />
+        tools:text="@string/github_user" />
 
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/layout_header.xml b/app/src/main/res/layout/layout_header.xml
index a2955dd..2d5ce4d 100644
--- a/app/src/main/res/layout/layout_header.xml
+++ b/app/src/main/res/layout/layout_header.xml
@@ -10,7 +10,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginHorizontal="10dp"
-        android:text="다니의 레포지터리"
+        android:text="@string/header_name"
         android:textSize="15sp"
         app:layout_constraintTop_toTopOf="parent"
         tools:layout_editor_absoluteX="10dp" />
diff --git a/app/src/main/res/menu/item_menu.xml b/app/src/main/res/menu/item_menu.xml
index 0fe9d6f..6057697 100644
--- a/app/src/main/res/menu/item_menu.xml
+++ b/app/src/main/res/menu/item_menu.xml
@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:id="@+id/nav_home"
-        android:title="홈"
+        android:title="@string/menu_home"
         android:icon="@drawable/ic_home_white" />
     <item android:id="@+id/nav_gallery"
-        android:title="갤러리"
+        android:title="@string/menu_gallery"
         android:icon="@drawable/ic_gallery_white" />
     <item android:id="@+id/nav_search"
-        android:title="검색"
+        android:title="@string/menu_search"
         android:icon="@drawable/ic_search_white" />
 </menu>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d23f290..359475f 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,41 @@
 <resources>
     <string name="app_name">INSOPTAndroidPractice</string>
+
+    <!--menu-->
+    <string name="menu_home">홈</string>
+    <string name="menu_gallery">갤러리</string>
+    <string name="menu_search">검색</string>
+
+    <!--Sign-->
+    <string name="sign_in_title">Welcome to SOPT</string>
+    <string name="sign_id_label">ID</string>
+    <string name="sign_id_hint">아이디를 입력하세요</string>
+    <string name="sign_pw_label">비밀번호</string>
+    <string name="sign_pw_hint">비밀번호를 입력하세요</string>
+    <string name="sign_in">LOGIN</string>
+    <string name="sign_up">SIGNUP</string>
+    <string name="sign_up_title">SIGNUP</string>
+    <string name="sign_up_email_label">이메일</string>
+    <string name="sign_up_email_hint">이메일을 입력하세요</string>
+    <string name="sign_up_email_error">이메일 형식이 올바르지 않습니다.</string>
+    <string name="sign_up_pw_label">비밀번호</string>
+    <string name="sign_up_pw_hint">비밀번호를 입력하세요</string>
+    <string name="sign_up_pw_error">비밀번호 형식이 올바르지 않습니다.</string>
+    <string name="sign_up_name_label">이름</string>
+    <string name="sign_up_name_hint">이름을 입력하세요</string>
+    <string name="sign_up_finish" >Sign Up</string>
+    <string name="sign_in_success_toast_msg">로그인을 성공했습니다</string>
+    <string name="sign_up_success_toast_msg">회원가입에 성공했습니다.</string>
+
+    <!--gallery-->
+    <string name="gallery_image_upload">이미지 업로드!</string>
+
+    <!--github-->
+    <string name="github_repo">Repo Name</string>
+    <string name="github_user">Dani Lee</string>
+
+    <!--header-->
+    <string name="header_name">다니의 레포지터리</string>
+
+
 </resources>
\ No newline at end of file