If already at the base os version, these updates are highly recommended. If running an older operating system, a thorough evaluation and preparation is advised before upgrading.
Update macOS on Mac
Use Software Update
Before installing new software, it's a good idea to back up your Mac. If you have an external storage device, you can use it to back up your Mac with Time Machine.
To check for new software, open Software Update:
From the Apple menu in the corner of your screen, choose System Settings. Click General in the sidebar, then click Software Update on the right.
Or in earlier versions of macOS, choose Apple menu > System Preferences, then click Software Update.
If Software Update finds new software, click the Update or Upgrade button to download and install it. You will be asked to enter your administrator password, which is the password you use to log in to your Mac. During installation, your Mac might show a progress bar or blank screen several times.
Update your iPhone or iPad wirelessly
Back up your device using iCloud or your computer.
Plug your device into power and connect to the internet with Wi-Fi.
Go to Settings > General, then tap Software Update.
If you see more than one software update option available, choose the one that you want to install.
Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do.
