Code Visualization : https://pythontutor.com/visualize.html#mode=edit
Videos : https://www.youtube.com/watch?v=R_wDA-PmGE4&list=PLliXbzY3XhUSJy3izXH-0ojiT3Uup8xbu
Algorithm Visualization : https://www.hackerearth.com/practice/algorithms/sorting/quick-sort/visualize/