Use the Help menu

In the Finder or an app on your Mac, choose Help in the menu bar, then do one of the following.

Open the macOS User Guide or the User Guide for an app: Choose macOS Help or [App] Help (such as Mail Help). This activates when selecting finder.
Search for a menu item or help topics: Start entering a search term in the search field. The Help menu lists menu items and help topics related to the term.

Use the help window

When you use the macOS User Guide or the user guide for an app, you can easily browse more topics, search the guide, and more.

In a user guide on your Mac, do any of the following:

Search for help topics: Enter a search term in the search field, then choose a suggestion or press Return.
Show or hide more topics: Click the Table of Contents button .
Show the previous or next topic that you browsed: Click the Previous and Next buttons.
See a list of recently viewed topics: Click and hold the Back or Forward button until a list appears, then choose the topic you want.
Make text bigger or smaller: Press Command-Plus (+) or Command-Minus (–).
Resize the window: Drag the right or bottom edge of the window.
Find words within the current topic: Press Command-F, then enter the word you want to find.
Print or share a topic: Click the Share button in the help window, then choose an option.