I learn a lot on YouTube. I like the platform because you can get good quality content packaged nicely into 10 minute videos you can watch while you're eating. If you cut through the garbage there are actually some very great educational videos out there. Since YouTube will serve you videos based on what it thinks you want, if you subscribe to enough educational channels and watch those videos soon your feed will be full of high quality content instead of cat videos.
My favorite YouTube channels in no particular order are: