How to connect to a Plesk server via SSH with available server's credentials

Login on Windows and Mac OS

Warning: If your Plesk server is managed by Hosting Provider, contact the company that hosts your server and ask SSH credentials, if you don't have it. It is required to have root access to the server to apply a part of Plesk articles. Plesk user's login details don't work for SSH as it doesn't have root privileges or may be disabled at all. 
If you have SSH credentials, here is the instruction on how to connect to the Plesk server via SSH.
For any issues during the connection contact your hosting's support department. Plesk company doesn't host websites.

Utilities

• For Windows, use PuTTY to do remote SSH logins from Windows.
• On Linux, use Terminal application. This application is available in every distributive.
• MacOS X also has Terminal app is installed by default. 

Additional information

How to connect to Amazon Lightsail server via SSH with a private key

How to connect to a Plesk server via RDP with available credentials