Sometimes I like to watch how someone does something cuz you can see interesting things

E.g watching developer write software can show you things about OS usage, IDE usage, automation and other tricks and habbits

That's fair. Someone commented in a different fork that videos are good for DIY jobs, and I totally agree. You want to see a person doing it live, so you can imitate their motions. I was thinking about learning something theoretical, like mathematics or history.