Before you start regularly saving and investing money, it's usually a good idea to pay down any debts you may have accumulated. Credit card debt, student debt, and even car loans can carry heavy interest rates that drag you down, demanding monthly installments that chip away at your revenue while racking up additional interest and penalties that take away even more money from your future self. Don't let this eat away at your potential; make it a first-line priority to get rid of your debt as soon as possible.
It is the same concept of being the top of a particular field. When you are the best at something, you find that opportunities come to you. To become an expert of something, it is crucial to never stop improving. Successful people invest time, energy, and money in improving themselves, and it might just be the most rewarding investment you can ever make.
People are always looking to have their cars washed and detailed. You could be a mobile car washer and detailer without having a permanent location. Reach out to people you know or make some flyers and put it in your neighbors' mailboxes. If you want to get serious about it, prop up a one-page website or give out business cards. You can make money quickly doing this.