⭕ Sorting Algorithms' visualizer: https://www.hackerearth.com/practice/algorithms/sorting/quick-sort/visualize/ https://visualgo.net/en/sorting ⭕ Number Theory (Code N Code) https://www.notion.so/Code-N-Code-fa88457ed92041e88d4cfb6c9de03b93 ⭕ Recursion and backtracking (Pepcoding) https://www.youtube.com/playlist?list=PL-Jc9J83PIiFxaBahjslhBD1LiJAV7nKs ⭕ CP and Stl tricks (Luv Yt channel) (https://www.youtube.com/channel/UCDzhFuVYou1D8w1ABZo3b9A) ⭕ For Queues - CodeWhoop https://www.codewhoop.com/queue/