Cooking
I learned one of my best cooking lessons from Hell’s Kitchen: taste taste taste!
As long as your food is safe to taste (i.e. not raw poultry or something), taste it, at every stage of cooking. You’ll find you get better at tasting foods and predicting what things your dish needs.
Also: cleaning. I’ve had flatmates who managed to take the same time for cleaning the bathroom or the kitchen and yet it somehow still wasn’t clean.
My mom was a fast order cook and when I was a teen she got me to help her run a fast food shop our family ran for a few years. She taught me how to work in a kitchen and how to cook.
Her basic rules were … if you aren’t cooking you’re cleaning, if you aren’t cleaning you’re cooking, and if you aren’t cooking or cleaning, get out of the kitchen.
If you aren’t cleaning as you go, the food prep area will get gross and unsanitary fast. This goes for cooking at home, too.