11. Forgive Others and Yourself

This is important because if you won't forgive others who have done wrong to you, you won't have a peace of mind. 
This is the first important thing you should do if you really are serious to be happy.
 But more than anything else, you should forgive yourself for the mistakes you've done in the past, for the things that you should have done, for the wrong choices you made in the past. 
There are many things you have to forgive yourself about. 
This is easily said than done but you should do it.