You must have heard about freelancing, and you may also have heard about freelancers making a ton of money in exchange for their expertise or services.
Big platfroms such as Freelancer, Upwork, and Fiverr and many others provide you such an opportunity. You can start earning serious money (starting from little cash until you work your way up to get more trust and make larger connections on the platform you work on).
One of these earlier mentioned freelancing platforms reported that they have more then 60 millions active users, and another one reported to have a total of 2.2 billion dollars spent in services. You can guess how much money you can gain in such massive environments while providing your services, your knowledge, your time or even your advice only for helping businesses in fulfilling their different needs.
You can start by registering in these platforms and filling your personal information and showcasing your skills and what you are willing to offer as services, beginnings may be tricky a little bit but it all pays off when you start getting good reviews on your profile.