1. Never spend more than you make, ever
When I was 10, I started cutting grass to earn money beyond my meager allowance. Minutes after earning my first buck, Mom was stuffing me in the car for a trip to the bank to open my first passbook savings account.
Fifty years later, priority one is still to put something aside from every paycheck and send out less than I bring in.
Of course, life being what it is, it hasn’t always worked out that way. But in general, getting richer every month is as simple as spending less than you make, and getting poorer is as simple as spending more than you make.