It's very simple really. Find a steady, well paid career that you enjoy, and keep current and flexible. Stay healthy. Pay yourself first by saving a minimum of 15% of every paycheck (preferably a lot more). Always live below your means. Borrow only for a home, or to make money. If you do take on consumer debt (including vehicles) pay it off ASAP. Learn as much as possible about investing (start reading here on the forum) and start investing in low cost funds with an appropriate asset allocation. Remember that nobody cares as much about your financial health as you do and keep tabs of your progress. Marry someone of like mind and avoid divorce.
I'm sure others will be along any moment now with other pearls of wisdom.