The Millionaire Next Door is a classic in personal finance literature. I can’t recommend it highly enough. It’s less a prescription for how to invest your cash but a description of who actually becomes rich.
Lawyers tend to want to think through what principles ought to apply in order to get to a certain result. Here are some examples: Make a lot of money, then you will be rich. Go to a good law school, then you will be successful. Make partner, then you will be rich.
These are all fine inferences if you want to think your way into disappointment.
Another way to figure out what gets a result is to look at when that result has happened, then study how it happened.