MongoDB

 MongoDB is an open source, document-based database management system that does not require a table schema description. MongoDB - classified as NoSQL and uses JSON-like documents and a database schema. If all four previous DBMSs are well known to most IT professionals, then few have heard of MongoDB. But she confidently takes the 5th line in almost all ratings. And as a result, in our ranking, she also occupies the 5th position.

Earnings on the site

 Earnings on the site

Another very popular way to make money on the Internet is to make money on the site, i.e. its monetization.

There are several ways to monetize a site:

Contextual advertising;
Sale of links;
Placement of banners;
Other types of advertising.
The disadvantages of this way of earning include the fact that you must also have certain skills, you must create a website, promote it, I talked about how to do it right in my article - Website promotion on the Internet - 6 methods of website promotion, and , of course, follow it, and generate quality content daily.