Play games with as much time as possible so you can think carefully.
Try to avoid losing your pieces and pawns at all costs. Before each move ask yourself if you are going to lose material.
Try to control the centre of the board with pawns and pieces.
Castle your king to safety in the corner every game.
Use all your pieces - they are like a team and must work together.
If you can capture pieces and win material then do it.
Try to make a plan - even if it's a bad plan it's better than having no plan at all.
These are some basics which will help you achieve a reasonable level. To become very good you have to start to understand when you can break these basic 'rules'.
Is there a way to play better?