Store in a cool, humid (but not wet) location. Store in burlap, brown paper, or perforated plastic bags away from light, in the coolest, non-refrigerated, and well-ventilated part of the house. Don’t store onions and potatoes together
Russets are ideal for baking or mashing.
Another foolproof way to enjoy is to slice thinly and place on baking sheet lined with tin foil, a bit of oil and salt. Bake at 450 until browned until both sides are browned.
If you want to get fancy, make a dip by mixing some mayo with scallions or Cholula or Sriracha hot sauce.