Life is too short to not enjoy every minute, so be sure to live life to the fullest every single day! Sure there will be good days and bad days, but learning how to have fun and see the beauty in every day is the most important. The truth is there are no "rules" to follow, but here are the most advised ways to live life to the fullest.
One of the most important rules to live life to the fullest is to laugh at everything. Try to find something funny in every situation. Even if something is not going the way you planned, always remember that you have very little control of a situation's outcome and that everything will work itself out soon enough. It's difficult to laugh when your world feels like it's crashing down, but just know this very important truth: everything happens for a reason, so laugh!