macOS Catalina 10.15

Get more help for iPhone, iPad, or iPod Touch
See your device’s user guide on the web for more information
Select the user guide you want:
Download your device’s user guide from Apple Books
You can download the iPhone User Guide, iPad User Guide, or iPod touch User Guide from Apple Books.
In the Books app
on your Mac, click Book Store in the toolbar, then search for a user guide.
Click the Get button under the user guide you want, enter your Apple ID and password, then click Get.
Note: The Apple Books version of the guide may not be available in your language.