A lot of good cooking is in technique. What’s something that you discovered or was told that really changed something meaningful for you? For me, I had struggled a lot to make omelettes. They always wound up becoming scrambled eggs because I sucked at flipping them over to cook on the other side (I like my eggs cooked pretty well so this was important to me.) Finally, watching someone else make an omelette, I noticed they didn’t flip it. They put a lid on the pan, turned the heat down, and let the top cook that way. I tried it myself and now I make almost perfect omelettes every time. Have you had anything like this happen to you? If so, what was it?
marinate your veggies before grilling. (onions, squash/zucchini.) 1-1 mix of oil and vinegar (or some other acid.) and salt. maybe garlic, herbs. whatever. brush on just a bit of a coating, it doesn’t take much.
also for grilled onions, get poultry skewers. before slicing the onion (so as to create rings,) run the skewers through, then just remove before serving. The skewer will keep them together. Perfect for burgers.
knife skills. This isn’t really a single technique, and it’s pretty freaking basic, but, work on your knife skills. Focus on being neat, the speed will come with practice.