For cooking then for me it's cook repeatedly. Like most things, the more you do it the better you get as you learn what works, what does not, what you like, how your oven/hob/pans work (because they all vary).

I must have a dozen or more 'cookery' books but they can't tell me how hot is hot, how my pans conduct heat, how different my oven is to theirs.

Keep cooking and maybe start by perfecting a food you love.