I recently started making videos on Youtube (Just to try out new stuff) and have made the Solution Ideas of all the problems of the CSES Advanced section. Feel free to tune in (actually good for all Indian participants having ICPC coming up, to get crux ideas of so many problems and topics in short). The Ideas are in Brief and if you have any doubts about them, would be clearing them off in the comments (on these problems mostly).
Also, for now, I have not added the solution codes as I feel it's much better of training without the code as it helps to improve the learning much more. But feel free to suggest if making them public would be the best route. Also, which section should I make next?
Link to Video: https://www.youtube.com/watch?v=lYEFvF8Xx2c
The Resources to Learn these techniques are in the Description of the Video.