Another starting point for opening strategy.
Try to classify your plays in the opening into three categories: tight territorial, loose territorial and destructive. These are neither good nor bad in themselves.
If the time has come at which you really must create a weak group for yourself, to keep in the game, it is probably the middle game.
An example of applying the principle about tight plays: forming a corner enclosure from a 3-4 point is tight. Therefore once it is made, extensions from it are preferably loose. If there is a fight in that part of the board, the corner already has a good base.