I can't speak for everyone but I found Sarada Herke's series on Graph Theory to be incredibly illuminating and I haven't really found anything of the same quali

I can't speak for everyone but I found Sarada Herke's series on Graph Theory to be incredibly illuminating and I haven't really found anything of the same quality elsewhere. Combine that with the fact that YT has the Strange Loop video archive, the Perl Conference, MIT OpenCourseWare, talks by Guy Steele, Gerald Sussman, Dan Friedman, Damian Conway, Rich Hickey, and so on, and so forth... even if we only look at educational material and ignore entertainment it's a vast treasure trove. Sure: some, if not most, of that stuff can be found elsewhere but there is value in having all of it available from a single source.