if you are good at developing websites , you could find small local clients who want to expand their web presence
you could deliver groceries , food , etc
you could drive a cab on the weekends using uber , lyft , didi , ola , etc
if you are good at social media marketing , you could find local clients in your area looking to market their companies
if you have spare rooms to rent , rent them out on airbnb
rent out your car on turo or zipcarwhen not in use
if you can babysit for cats and dogs , register at rover.com and you will get clients .
you can manage some airbnb properties – making it ready for people , cleaning up after these people have left , offer airbnb experiences – be like a tourist guide for the people visiting
if you are good at search engine optimization , you can offer these services
some websites where you can offer your services – upwork.com , fiverr.com
do trading in stocks , options , commodities , currencies ( training needed , some spare cash and a brokerage account needed )
have a passive stream of income like real estate that is rented out , a website blog where people visit regularly and advertisers pay the bills