How to install and consume unofficial Plugins

I am new to the tool and would like to know about a documentation or tutorial on how to install and consume unofficial Plugin?

this tool can support other plugins such as

Thank you very much in expert.

If I'm not mistaken, the exercise on the plugin section of the mobile development training shows how you can create a new plugin from a cordova project:

You can also look at the projects of other plugins to see how exactly the JavaScript side is handled.