The most powerful thing you can invest in is yourself. You can invest in a business endlessly, and the value of the business will go up, but investing in yourself allows your own value to rise along with your business. Build yourself up, make your skills and knowledge indispensable and you will never be out of a job no matter what the market looks like. I think the most important thing on this list is the Gym/Diet because without health you cant do ANYTHING. Make sure you have that in order before you focus, not only for the longevity it can bring you, but you will also start to see the immediate benefits of living a healthy life. More energy and focus means you can be that much more productive!