Try not to move pices more than once in the opening.
Don't force players to do what they were already probably going to do.
With a few exceptions (queens gambit, etc.) leave the c and f pawns alone in the opening.
Try to get your kingside rook on the e-file after castling.
However, other than that, leave your rooks alone as a general rule.
Try not to overextend your pawns, keep them close enough that if attacked can easily be protected.
For every move that you make, either think of two good reasons to make it, or pick a different move.
I am putting together a list of very basic principles for teaching the concepts (as opposed to memorizing a list of openings since I don't want anyone just learning the game to be overwhelmed).
1. Control of the center of the board is your goal because many pieces have more mobility and opportunity in the central squares. This means developing your d and e file pawns to start. As a novice player, you want to stick to very basic strategies.
2. Develop your pieces with tempo which means you want to move a piece once into a good position attacking or defending the central squares.
3. Develop Knights before Bishops and keep those Knights attacking the central squares. A Knight on the rim (edge of the board) is dim.
4. Try to attack and defend a square with multiple pieces.
5. Castle Kingside if possible, early in the opening of the game.
6. Do not bring out your Queen early since she is an attractive target.
7. Look at the big picture or the entire board.
Feel free to add to this. I am trying to build up a simple opening principles guide that will allow new players to get a feel for opening strategies. Thanks for your help....Hugh