My second rule of investing is...Buy it ON SALE! (Get a good price on it.)
Since learning how to manage money, I've learned that it's not important HOW MUCH money you make, it's HOW MUCH YOU KEEP.
This has been invaluable, as this has allowed me to accumulate more money than many of my former coworkers who earned more than me. However, it's not the whole story.
The whole saying should read...