For instance, what I've always done and it has worked very well for me is the following:
1. Maintain constant revenue stream, even if work is part-time or all you have is just an investment paying dividends.
2. Never purchase anything you can't pay for in cash at that moment.
3. Try to save 10% of your income every month - even in low income months.
4. Don't be wasteful and don't blow money on "small crap" you don't need. i.e. junk food, fast food, trinkets, taking unnecessary trips or riding first class, leaving devices/lights on in your house, gym/any memberships or monthly recurring fees you don't absolutely need.
5. Finally, don't purchase things on a whim.
I've tried to live by these rules my whole life, learned them from my Dad, and they've worked very well for me. I spend money, but usually only for high quality things I research into for a long time before purchasing, like a piano, a plot of land, tools, etc.
I have zero knowledge of actual research into personal or home finance so this example is just my gut intuition based on personal experience, so just view it as a biased anecdotal opinion :)