1. https://youtube.com/playlist?list=PL-Jc9J83PIiFj7YSPl2ulcpwy-mwj1SSk&si=HNsLC3e02JjcHOPM
2. For Dynamic Programming
   1. https://www.youtube.com/playlist?list=PL_z_8CaSLPWekqhdCPmFohncHwz8TY2Go
3. For Theory and Working of Data Structure
   1. https://www.youtube.com/@abdul_bari/playlists
4. https://takeuforward.org/interviews/strivers-sde-sheet-top-coding-interview-problems/