Here is a brief review of the concept of outpost squares. Anoutpost square is any square that cannot be attacked by an opposing pawn, and may be defended your own pawn.
White would have: 1. d5 2. f6 and h6 3. a6 In this hypothetical position there are no pieces of course, but the pawns suggest these squares as desirable destinations for white's knights and bishops.
Black would aim to occupy 1. d4 2. f4 in front of the isolated pawns 3. h3 or h4 would be nice places to infiltrate the position due to the isolation of the h pawn.
Credit due to the book Positional Chess by John Love