If you are skilled in a field that is in demand, like data entry, writing graphic design, teaching, you could sell your services online. There are also jobs you can do from home for example, such as translating.
Renting out spare rooms, garages, or backyards could be an excellent way to earn money.
You can hire a programmers if you have an idea for an app but do not know how to code. They can turn your idea into reality. This is one of the most efficient methods to earn money online.