I like tech, old and new, so:

https://www.youtube.com/@CathodeRayDude

https://www.youtube.com/@TechTangents

https://www.youtube.com/@ConnectionsMuseum

https://www.youtube.com/@VeronicaExplains

https://www.youtube.com/@UsagiElectric

https://www.youtube.com/@PlatimaTinkers

https://www.youtube.com/@RetroBytesUK

https://www.youtube.com/@harkeofficial

I"d also suggest Jeff Geerling but he’s close to a million subscribers.

About trains, cycling, transit, and urbanism:

https://www.youtube.com/@OhTheUrbanity

https://www.youtube.com/@BenDurham

https://www.youtube.com/@MilesinTransit

https://www.youtube.com/@JagoHazzard

https://www.youtube.com/@TFTSB

And about hiking, camping, outdoors stuff:

https://www.youtube.com/@StephenJReid

Oh and on languages and etymology:

https://www.youtube.com/@WordsUnravelled

https://www.youtube.com/@RobWords

https://www.youtube.com/@Xidnaf

https://www.youtube.com/@kklein

https://www.youtube.com/@Linguisticae (in French)

https://www.youtube.com/@Linguriosa (in Spanish)

I’m shocked nobody has mentioned Bobby Fingers (266k subscribers at this time). He’s a sassy Irish man with a really deep voice who makes incredibly detailed dioramas of weird moments. My favorite diorama is the one he made about Fabio Lanzoni (the sexy guy on the cover of hundreds of romance novels) getting hit in the face by a goose while riding a roller coaster: https://youtube.com/watch?v=2RIEPKEhE2s

It’s absolutely spectacular. He sculpts the faces out of clay in 1:1 scale, scans them, 3D prints them in miniature, and just goes above and beyond. The videos are funny as all fuck too, with tons of jokes with long setups. I’d highly recommend them.

This is a fairly niche answer, but Noah Caldwell-Gervais.

He does very smart critical analysis of video games as a medium, often in multi-hour long retrospectives of entire franchises. They are all split into chapters, so it’s easy to watch in parts. The visuals and editing are not very flashy, pretty much just footage of the game he’s talking about, but they are so well written and thoughtful I find them extremely compelling. There’s also road trip travelogues, but I’m not as into those.

Adam Conover - the guy who shattered my reality back in the days with some college humor videos https://m.youtube.com/@TheAdamConover

Windette - Gaming with insults https://m.youtube.com/@Windette

Adam Millard - game mechanics and fundamentals https://m.youtube.com/@ArchitectofGames

Daryl talks games - games dissected by a psychology guy (I forgot what he did) https://m.youtube.com/@DarylTalksGames

Cara Nicole. She does a good job at explaining finance and budgeting to the layman, I liked her because I found that what she said more or less aligned with what I’ve found to be true, so I think she’s sending out smart ways of managing money to people. Plus she does fun videos about things like giving financial audits to Michael Scott and breaking down people’s wish lists. Idk I always enjoy her videos.

https://youtube.com/@thefinancialfreedomgirl

pretty much any Japanese band

Todd in the Shadows Some More News Folding Ideas Thought Slime Atun-Shei Films The Morbid Zoo

Learn Linux TV. Great educational channel for all things Linux.

I really like Dime Store adventures. He makes videos about local history and folklore of the New England states in the US. He puts a lot of effort in his research, and his way of telling the story is really engaging.

People Make Games, Actually serious/critical Journalism about the games industry.

Also Benn Jordan, he makes videos about music, music industry, making music, few tech videos too.

FatBrett for his videogame essays on character analysis of villains and heroes. I have more videogame essays people to recommend, but I’ll just throw some names if you’re interested Raycevick, Razbuten, Adam Millard.

Hakim

https://www.youtube.com/channel/UCPPZoYsfoSekIpLcz9plX1Q

Hakim is an Iraqi Marxist-Leninist YouTuber. He covers a wide variety of topics including socialist history, the negative effects of capitalism, and other-related topics. He also does response videos to various right-wing figures, such as PragerU, Misha Petrov, and Jordan Peterson.

Alexander the Ok - 101k subscribers, does some great hour long engineering / computer science videos. F-14 central air data computer (first microprocessor), Minuteman missile (led to the first desktop computers), B-29 turret system (networked mechanical computers), and Buran (not really computers, but a really good video anyways).

Luetin09 apparently only has 901k subscribers.

SomeMoreNews is at 884k.

DoshDoshington is at an unacceptably low 309k.

Atrioc is up near 706k.

And everyone should be subscribed to YoungScrolls but sadly only 269k people are.

Perun does some excellent defense economics and analysis. Probably one of the channels I have learned the most from.

Jake Broe does regular updates on the Russo Ukraine war which I always find helpful.

And finally, Zeihan on Geopolitics, does, well, what the name says. I find he brings ideas I hadn’t thought of, or that are not well explained, into clarity.