watching a few good videos is a great way to FEEL like you're learning. just cuz you watch a 15 hour videoo course on c doesn't mean you can write c any more than watching a 2 hour video course on kung foo means you can kick like bruce lee

The best Elearning platform I've found is mathacademy. no videos. just short texts on how to solve a problem and then a bunch of problems with increasing difficulty. much more efficent if you want to actually learn a skill.

TLDR: you learn by DOING