I'll give a list of my favorite channels.

Comedy: LoadingReadyRun, Alastair Beckett King, Scott the Woz

Video essays and education: Hbomberguy (hilarious video essays on all sorts of topics), Philosophy Tube (philosophy and politics), potholer54 (debunking scientific misinformation), Sarah Z (fandom history and queer discourse), Adam Neely (music), Simon Clark (climatology), PBS Space Time (astrophysics), LegalEagle (US law)

My niche interests: MattKC (retro technology), Steve Shives (Star Trek and comedy sketches), Jessie Gender (Star Trek, other sci-fi, and politics), The Wonky Angle (Electronic music and YTPs), Nicco Loves Linux (take a guess), Tolarian Community College (Magic: the Gathering), TheZZAZZGlitch (technical details and glitches of Pokemon and other Nintendo games), jan Misali (a bit of everything)