UX suggestion: add to playlist button and optimize video replay.

There's a lot of information given in each video and there are some things I know I will forget without revisiting (I'll notice the complexity of a lesson while watching).

It would be nice if I can add certain videos to specific lists (that I can make) for each topic to brush up on later.

Also, when a video ends, I should have the option to replay it as well, since the only option is auto-play. (Opening a new tab, and clicking replay within the millisecond is annoying. I don't know if I'm doing this wrong, but if I am, the solution isn't obvious).