I mean, that describes the vast, vast majority of Youtube channels, but...

Esoterica[0] scholarly explorations of occult texts and practices (also see Religion For Breakfast, hochelaga)

Kaz Rowe[1] historical essays, usually LGBT inclined (also see Matt Baume, Contrapoints, T1J)

Secret Galaxy TV[2] toy and tv history (also see Kenny Lauderdale, Pushing Up Roses)

Freya Holmer[3] Math, gamedev and tech (also see gamesfromscratch, javidx9)

Steve Shives[4] Politics, Star Trek and pop culture (also see Jesse Gender, Kat Blaque, Trekyards)

Drachinifel[5] Boats and boat related accessories (also see Dr Alexander Clarke, lindybeige)

Scholagladiatora[6] Swords and sword related accessories (also see skallagrim, shadiversity, themetatron)

Justin Whang[7] Internet culture and lost media (also see sakura stardust, LsupersonicQ, blameitonjorge, wendigoon)

[0]https://www.youtube.com/@TheEsotericaChannel

[1]https://www.youtube.com/@KazRowe

[2]https://www.youtube.com/@SecretGalaxyTV

[3]https://www.youtube.com/@Acegikmo/videos

[4]https://www.youtube.com/@SteveShives

[5]https://www.youtube.com/@Drachinifel

[6]https://www.youtube.com/@scholagladiatoria

[7]https://www.youtube.com/channel/UC3jdnIP2u5hCJpVZ-TuDrCg

Also prior HN threads:

https://news.ycombinator.com/item?id=32220192 (316 comments)

https://news.ycombinator.com/item?id=20385679 (143 comments)

https://news.ycombinator.com/item?id=7609584 (128 comments)