Preheat the oven to 400°F (200°C)
Wash the potato thoroughly
Dry the potato completely
Pierce the potato several times with a fork
Rub the potato with oil if desired
Sprinkle with salt if desired
Place the potato directly on the oven rack or on a baking sheet
Bake for 45 to 60 minutes
Check for doneness by inserting a fork or knife
Remove from the oven
Let it cool for a few minutes
Slice open and serve