I don't cook extravagant stuff often (extravagant as in I cant put it in the oven or microwave and be done) but when I do I just get some meat like chicken/steak and some vegetables, and onions, and peppers, and random spices, and just throw shit in and keep tasting it till it tastes good. Way more fun that way, imo.
It's good you have this mindset, though. When I got my own place at 17 I barely cooked EVER. I bought so much fast food and I regret it now. Was a huge waste of money and terrible for my body. Now that I'm 20 I hardly eat fast food, but still haven't gotten to the stage of cooking all your meals and not being a frozen pizza haha but I'm getting there.