docs(core): add intro to Nx course

docs/courses/explore-nx/course.md

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+---
+title: 'Introduction to Nx'
+description: 'New to Nx? Then this is where you should start.'
+authors: [Juri Strumpflohner]
+---
+
+This course gives you a quick high-level overview of Nx, how running tasks works, task caching, how Nx provides code scaffolding functionality and how you can use `nx migrate` to automatically update your workspace dependencies and code across breaking changes.

docs/courses/explore-nx/lessons/01-why-nx.md

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+---
+title: 'Soo..what is Nx?'
+videoUrl: 'https://youtu.be/-_4WMl-Fn0w'
+duration: '9:28'
+---
+
+This video gives you a birds-eye view of Nx in ~10 minutes. It covers topics such as:
+
+- What is Nx
+- Nx Architecture
+- Add Nx to an arbitrary project
+- Why would adding Nx be useful?
+- Nx in a PNPM monorepo
+- Why use Nx Plugins
+- Setting up a new Nx Integrated Monorepo
+- Abstracting low-level configs
+- Automated Code Updates
+
+Read more [in our docs](/getting-started/why-nx)

docs/courses/explore-nx/lessons/02-run-tasks.md

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+---
+title: 'Run Tasks with Nx'
+videoUrl: 'https://youtu.be/aEdfYiA5U34'
+duration: '4:19'
+---
+
+Learn how Nx provides a powerful task runner that allows you to:
+
+- easily run multiple targets for multiple projects in parallel
+- define task pipelines to run tasks in the correct order
+- only run tasks for projects affected by a given change
+- speed up task execution with caching
+
+Read more [in our docs](/features/run-tasks)

docs/courses/explore-nx/lessons/03-cache-task-results.md

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+---
+title: 'Cache Task Results'
+videoUrl: 'https://youtu.be/o-6jb78uuP0'
+duration: '8:50'
+---
+
+Learn how Nx's sophisticated caching system ensures code is never rebuilt twice. This:
+
+- drastically speeds up your task execution times while developing locally and in CI
+- saves you money on CI/CD costs by reducing the number of tasks that need to be executed
+
+Read more [in our docs](/features/cache-task-results)

docs/courses/explore-nx/lessons/04-generate-code.md

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+---
+title: 'Generate Code'
+videoUrl: 'https://youtu.be/hSM6MgWOYr8'
+duration: '4:11'
+---
+
+Learn how Nx's code generators help boost your productivity by:
+
+- Allowing you to scaffold new projects or augment existing projects with new features
+- Automating repetitive tasks in your development workflow
+- Ensuring your code is consistent and follows best practices
+
+Read more [in our docs](/features/generate-code)

docs/courses/explore-nx/lessons/05-automate-updating-dependencies.md

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+---
+title: 'Automate Updating Dependencies'
+videoUrl: 'https://youtu.be/A0FjwsTlZ8A'
+duration: '4:45'
+---
+
+Learn how Nx migrate functionality helps you:
+
+- automatically update your package.json dependencies
+- migrate your configuration files (e.g. Jest, ESLint, Nx config)
+- adjust your source code to match the new versions of packages
+
+Read more [in our docs](/features/automate-updating-dependencies)

docs/courses/pnpm-nx-next/course.md

@@ -1,7 +1,6 @@
 ---
 title: 'From PNPM Workspaces to Distributed CI'
-description: ''
-slug: nx-19-8-update
+description: 'Learn how to transform a PNPM workspace monorepo into a high-performance distributed CI setup using Nx.'
 authors: [Juri Strumpflohner]
 repository: 'https://github.com/nrwl/nx-course-pnpm-nx'
 ---