Preheat oven to 350F
Wash potato with a stiff brush under cold running water.
Poke a fork into the potato in 10-12 places, all over, and to the base of the tines.
Coat the potato in oil, sprinkle some salt on top.
Place it directly on the rack in the middle of your oven (rack at top third), with a pan underneath to catch any drippings.
Bake for 1 hour, or until it feels soft, and the skin is crispy. If you're cooking multiple things in the oven, expect to add 15 minutes to the cooking time.