You will need a package manager.
It is probably already installed.
The major one is called pip
This will manage all your Python libraries in a single place.
The package indexer
If you are looking for a package it is probably referenced here :
Check the library documentation
For every library there is a documentation,
Most of the time you will find the "How to install" section in the library documentation.
If you follow the commands they ask you to do everything should be fine.
The most basic installation command
The most common command with pip is the install command, it will install any package supplied to this command
Here you are, you should be all set to use this library in your Python workflow !