For me personally, literally all cooking. If it's more complex than boiling pasta or using an air fryer, I'm useless at it.
And I find it so hard to motivate myself to get better because I often fuck up and have to throw out food when I try something new in the kitchen. Plus I'm usually cooking because I'm actually hungry and want to eat, so that risk factor of knowing I might need to start over and make something else if I screw up isn't something I want to deal with.
Chop veggies, or if you’re lazy get one of those party trays of pre-chopped veggies. Throw in frying pan with oil. Continually taste test for doneness (helps with hunger). Broccoli might need to be steamed (cover the pan for a minute or so until it’s bright green). Then season with whatever. You can buy pre-mixed seasoning.
Do the protein separately. Cube chicken or pork and fry until it’s not raw. Or just toss it on a George Foreman and cube after.
Even easier-fajitas : onions and bell peppers cut about even and cooked for a bit in a bit of oil ( even a splash of water works) with a packet of fajita spice mix from the store. Cook a little longer for less crunch). Rotisserie chicken for the meat. Tortillas and cheese slices with rice if you want- boil in a bag is a-ok.
Or try frozen veg + golden brand Japanese curry. Same chicken and rice as above.
Stir fry is easy, but tricky to master the different cooking times. (These dudes might be selling themselves short, but who knows)