You could read and put into practice the principles below - and never do anything else - and you would be in better shape than most everyone you know.
Spend less than you make.This sound simple, but it's not. The goal is to live humbly as a general rule.
Learn how to make more. Invest time and money to learn the skills in demand today.
Have more than one income stream. There are many ways to do this, but the trick is not to spend all your time actively working.
Invest in an index fund. And then don't look at it very often. The best results come to those who don't try to time the market, or pick stocks, or think about what's hot.
If you just do these things, you're well on your way!