How to add and use @ionic-native plugins?

There are many plugins you can use in your project, see:

Click Tools -> npm Packages to add the package to your project,

Select the table, go the the Code tab,

Select the page in which you want to use the plugin,

Click the imports node, enter the import statements, e.g.
import { Push, PushObject, PushOptions } from '@ionic-native/push/ngx';

Click the services node, enter the arguments for the constructor, e.g.
private push: Push

Then in your methods, you can use it, e.g.