My favorite YouTube channels are: Bjorvala Bonsai Studio, GrahamWPotter, OrlandoBonsaiTV, Dallas Bonsai, mikbonsai, chasnsx and ellwoodbonsai
For fellow novice to intermediate hobbyists, I kind of like Johnny Bonsai and TheBonsaiStudent.
For weak videos or downright bad advice, try bonsai9723 (the "new easy method" sphagnum moss guy) and BONSAI HUNTERS.