Knowledge, for sure. Like the old adage goes, "Knowledge is Power."
Based on our poor education system, it would seem that most people mistake memorization, or mere study of theory, for knowledge. Actual knowledge would have to include knowing the practical application of what you learn. Not just the theory. In other words, how to do it, or how to actually use what you learn. Success in any endeavor then becomes a lot easier. It only requires doing the actions and functions that bring about the success, or results.
So, if you have the knowledge necessary to gain any amount of money, you can.
If you have the knowledge necessary to achieve fame, you can.
If you have the knowledge necessary to gain and keep love, you can.
The whole world is then open to you.
The body and looks you have, are what you have. There are limits on what you can do to change it. But, if you have the knowledge necessary in terms of health, beauty and fitness, you can make the best possible improvements to your looks and physical form, within the limits of what's available and your genetic and structural endowment.
The only question is, how do you gain that practical knowledge. It sure seems to be something you cannot learn in today's schools or universities. But, with Study Technology, you can.