Ben Eater: explains and builds 8 bit computer, vga graphic card etc.

This Old Tony: machinist with great sense of humour

PBS Spacetime: space, time, and all inbetween

Tom Scott: interesting random stuff

Technology Connections: how basic tech works

Gamers Nexus: truly infomative pc news with 0 bs packed in.

Cody's Lab: a teen doing somewhat easy projects that just noone ever does.

Stuff Made Here: guy builds stuff, like a haircut robot or gun pellet powered baseball bat.

Kurgesagt: short videos explaining various topics with great animations

JohnnyQ90: machinist building motors and rc cars as a hobby, no spoken word.

TryMike4Instance: dota montages that are actually good.

Lindybeige: explains historical tppics in depth.

Two Minutes Papers: AI news

zefrank1: this guy is something else. His older videos are similarly weird in totally different style.

Barny64: World of Warcraft videos that are actually entertaining to watch.

exurb1a: your irregular dose of existential crysis

Applied Science: guy building cool stuff (like his own electron microscope) "from scratch" and explaining everything as he goes along.

Internet Historian: to not forget what once was, and laugh.

Trago: before his "podcasts" an awesome short videos about film making.

Marco Reps: dude repairs electrics stuff, or just messes with it.