Discover God (pure monotheism), save 20% and invest in stocks. If you don't know which ones then diversified etfs with a good mix should suffice. Start early and you'll have a lump sum to enjoy by the time you're 30-35, maybe even retire, travel the world next people.
The book would include the who, what, when, where, how, why a few examples here and there.
It will be a fun way to read through if you decide to write about a guide to life. Just make sure it's a guide to a better life and be ready for the critics as it's always will be for every writer.