Curiosity Show - the channel uploads content from an old (70s and 80s mostly) australian kids show where the hosts perform table top experiments, or simply explain something in a way interesting to kids. The fact that a brazilian guy aproaching his forties can still be kept entertained is a testament to the quality of the show. Presented by a pair of utterly enjoayable guys, both holding phds.
https://www.youtube.com/c/CNLohr - making electronics and software projects while working around amusing constraints
https://www.youtube.com/c/scanlime - hardware electronics hacker, thorough knowledge of transistors to gateware
https://www.youtube.com/c/SladorSoft - small pieces of info on logic design
https://www.youtube.com/c/SammSheperd - drone and UAV design. simply best of the best. unfortunately he passed away. RIP SNRS
https://www.youtube.com/c/PhilS94 - PCB design
https://www.youtube.com/c/RobertBaruch - logic design
https://www.youtube.com/user/0033mer - laid back electronic circuits
https://www.youtube.com/user/MacPuffdog - fully home brew quadcoptor design