This book is very clear and straight to the point with no filler. Probably one of the best self-help books out there.

This book teaches that you must accept the fact that we all have problems and we'll always have problems, you cannot escape them. But fortunately, we can CHOOSE which problems we do have, and we do that by choosing what to give a f**k about. It all starts by selecting your values, i.e. how you measure success/failure, in other words, your metric system. Then you can carefully select the problems that you would be happy to solve. Happiness is just that; solving good problems. Once you've solved it, move on to the next!