Upwork, Fiverr and Freelancer.com is a marketplace that can help make money online in different ways. These websites provide great opportunities to do a variety of freelance jobs like content writing, programming, designing, Digital marketing, data entry and being a virtual assistant to your business and companies. It doesn't matter what kind of knowledge you have or you can do, keep a sample of your service with the rate of work you provide. You  must know if you are charging too much or too little. This action you can easily make profit and success. Another way to make money from home is on sites like your own website build. You get payment for your thoughts on how to do or not by how well  certain websites and apps worked. 

There are several websites like Upwork, Fiverr, and Freelancer.com that offer great opportunities to earn money online by doing freelance jobs in various fields like content writing, programming, designing, digital marketing, data entry, and virtual assistance. It's important to keep a sample of your work and set a reasonable rate to make a profit. You can also make money from home by sharing your thoughts and feedback on how well certain websites and apps work. Having your own website is another way to earn money online.

Online work has never been in more demand and more accessible than today. Especially after the recend pandemic and people's realisation of remote work benefits.

Like @forinnder said, sell yout time/services on freelance websites like Fiver, Upwork etc, they are leggit but unfortunately it is not a constant income untill you become known on those platforms.

If you're in for the long run, create a website and monetize it via ads and affiliate marketing. That is the most scalable and proftable choice in my opinion.