If you lose life points, check if you have food in your luggage, you can recover life points by eating. During attacks you can not eat.
Potions are very pretious. You can take them during attacks without losing turns.
If you are a magician, retain some mana in case you need to perform a life recovery spell.
The writer of the game might have forecasted that you are going to make a detour in your path, so that you get more powerful objects or experience, which will help you confront your enemies later. Check that you know all the routes. Some of them may be important.
Some readers despise Charisma, Perception or Intelligence, and focus on Strength, Agility or Resistance. They think that all battles are worth fighting, and that is not always the case. Sometimes you get more experience by avoiding a fight, rather than facing you enemies.