Crash Course is all in one channel that will make you learn literally everything. Like, literally Frome history, to science, to economy, everything here will economy, everything here will make you become smarter
This is my favourite. This channel will teach you a lot about human psychology, philosophy, and just how to life a better life in general.
Ted Talks are the biggest source of informations you can have, and there's so many different subjects you can choose from.