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.
I have always subscribed to paying yourself first, keeping debt under control and living within my means. Fortunately my wife and I have always made pretty good money so it was fairly pain free to be successful. We were so fortunate to not have any breaks in our work history which is a huge factor. For those who need to dip into savings to cover a long period of work outage, it can be devastating. I’m now at retirement age, house is paid for, no debt, million++ in investments…. You don’t know good it feels to be able to sleep good at night knowing that you can deal with anything that comes up.
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.