The official Plesk Panel help documentation is available directly within the Plesk Panel UI (Plesk Onyx / MWP 2 servers only).
Access Plesk Panel Inline Help
From any page in the Plesk Panel, click the ? button in the top-right of the page:
Context relevant help will appear, inline, on the right-hand side of the page:
Finally, you can also access context-relevant help pages from the Help menu, a the top-right of the Plesk Panel header.
To view the complete help documentation for Plesk Panel, please see the following: