Rules of thumb for chess openings

Open with either the Queen's pawn or the King's pawn.

Wherever possible, make a move which threatens something.

Develop Knights before Bishops.

Pick the most suitable square for a piece and develop it there once and for all.

Make one or two pawn moves in the opening, not more.

Do not bring your Queen out early.

Castle as soon as possible, preferably on the King's side.

Play to get control of the center.

Always try to maintain at least one pawn in the center.

Do not sacrifice without a clear and adequate reason.