It is an ongoing process.

Learned the basics from parents, friends, and others when young. Nothing fancy, just how to cut things and apply heat when needed.

As a young adult learned more from the internet, expanded what I could make a bit. Kept it simple because undiagnosed ADHD made complicated cooking tedious. Baking was fine because it is a regimented process with exact measurements and steps!

As an adult learned from my wife, Good Eats, Youtube, and more. Learned how to cut properly, what 'high, medium, and low' on the stove actually means. Learned how to adjust cooking for different pans and stoves and whatnot.

Still not great with remembering which spice adds what flavor and frequently still guess wrong on temps and whatnot because I don't cook often enough for it to stick, but still improving. Next month I will most likely be cooking almost daily and the increased frequency will be great practice that greatly improves my skills as well.