Use About This Mac to check the version of Mac operating system installed, and find out whether it's the latest (newest, most recent) version. Which macOS version is installed? From the Apple menu in the corner of your screen, choose About This Mac.
Refer to the manual for your Mac when you need information that’s specific to your model, such as supported connections and expansion information.
Ask Siri. Say something like: “Open About This Mac.” Learn how to ask Siri.
Choose Apple menu > About This Mac.
In the macOS Resources section, click User Manual.
You can also:
Download MacBook Air Essentials, MacBook Pro Essentials, MacBook Essentials, iMac Essentials, iMac Pro, and Mac mini Essentials from Apple Books.
Get manuals and related documents for MacBook Air, MacBook Pro, MacBook, iMac, iMac Pro, and Mac mini from the Apple Support manuals website.