Channels like, "It's Okay To Be Smart" and "Physics Girl" are usually humorous and hard to take seriously. I would not recommend them if you want a serious lecture. Channels like Fermilab and Veritasium are good for more complicated lectures and in-depth explanations of concepts rather than quick overviews of them. Other than that, I am looking for interesting channels that go into depth myself. If you have any suggestions, please reply to this comment with your favorite science channels.