I recently started to improve my cooking skills as well, and here are my favorite YT channels:

I love them because not only they teach you skills and give amazing recipes. Some of them also get into the chemical / health science which explains why things are happening as they do.

- Adam Ragusea

- Chef Billy Parisi

- Chef Jean Pierre

- Ethan Chlebowski

- Sip and Feast

- J. Kenji Lopez

- Pro Home Cooks

P.S. Cooking really helps me to deal with work related stress and burnout. Hopefully I'll make it my second profession some time soon.