The best cooking YouTube channel I've found are Food Wishes and J. Kenji López-Alt. Both of these channels focus on making a specific dish in each video, but they explain the why of the ingredients, cooking techniques, prep skills. Especially from a food science perspective, their knowledge was so deep and they clearly have a lot of experience in restaurants.
This helped me understand what role each ingredient and cooking step actually does. Similarly, they have great advice on efficiency so that cooking doesn't take as long or as much work.