I never used to keep track of my expenses, which was my biggest mistake. My friend Peter was working on a project for a company that bought ideas https://radicalfire.com/invention-companies-that-buy-ideas/ a few years back. He was developing a mobile app to record expenses and revenues and asked me to test this app. As a result, my expenses were reduced, and I realized I spent too much on fast food and coffee daily. Try to follow where your money goes. I think many of us spend money every day on stuff we don’t need. Report your income and expenses through an app or just in notes.