Before an interview prepare a list of questions for them, they expect it!
My list to give inspiration:

Describe your company culture? - if the response is buzzword heavy, avoid.

What’s the oldest technology still in use? - all companies have legacy systems but some are worse than others

Describe your agile process? - a few companies I’ve interviewed with said they are agile but it’s actually kanban

Are developers involved with customers?- if they trust you to talk to customers you can infer trust to do your job ( I’m sure others will disagree)

Describe your development environment?- do they have such a thing as dev, test and prod?

These are the only ones I can remember but should give others a bit of inspiration I hope 😄

Please recommend me good YouTube channels about programming (not tutorials)

Well that's a fancy shirt

My girlfriend has these :D
(called Code:Deck - available here https://varianto25.com/playing-card...)