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 social networks

 Earnings on social networks

Today, this way of earning is becoming more and more popular, it consists in placing ads in your account or group on a social network. It is very fashionable now to advertise on Instagram, but VKontakte, Facebook, and Odnoklassniki are also popular.

But as always, not everything is so simple, because in order for advertisers to want to advertise with you, you need to promote your account or group, gain a huge target audience, only in this case advertisers will contact you. And in order for your account or group to become popular, you must post high-quality content in it and actively engage in promotion.

The pluses include the fact that this way of earning does not require the creation of your own website.