Easiest and hardest to screw up -
Bake fish in a pouch in the oven.
Take two fillets - what you'll usually get from the store - of whatever fish you like, I like salmon and red snapper.
If the fish was frozen or wet in any way, dry with a paper towel.
Cover both sides with salt and black pepper, and I like paprika as well if you have it.
Lay a few slices of lemon on top of each of the fillets - optional but good step.
Take either Aluminum foil or Parchment paper, place the fish on it.
I usually throw some veg in there, onions and bell peppers work great, hell anything will work just fine.
Fold the edges of the foil over to cover the fish and then another piece on top, or just use one big piece to begin with. Just make sure it's sealed up nice and tight on any seams.
Throw in a 375 degree oven for about oh 13-15 mins depending on the size of the fish, your oven, and how well you like them done.
This method is easy, takes little cooking experience and results in a juicy and flavorful fish. You can switch up the recipe in any way you like - sometimes I put olives in there, sometimes jalapenos, sometimes a little white wine to cover everything.
Don't overcook! Fish goes from being rare to perfect to overcooked very quickly; it's okay to take the fish out early to check it, better to do that then to leave it in even two or three minutes too long.
Enjoy. Bout as simple as it gets.