Learn from the experts; you will not live long enough to figure it all out by yourself.
To be truly happy, you need a clear sense of meaning and purpose in life.
Your ability to work with others on a complex task is a critical skill for advancement at work.
The one human quality that must be developed is self discipline for success. The will power to force yourself to do what you know you should do when you should do it, whether you like it or not, whether you feel like it or not. Success is tons of discipline.
Goals are the fuel in the furnace of achievement. Think on paper and write them down!
Whenever you set a goal of any kind, you will have to grow and develop to the point where you are ready to achieve it.