how i can update macOS on mac -apple

Hello, ivyduong.

How to Upgrade  macOS:

The macOS version you can upgrade to depends on the model and year of your Mac.

For details about your Mac model, click the Apple  icon at the top left of your screen and choose About This Mac.

❗️ – IMPORTANT – Backup your data. (You’ve been warned.)

Learn How to Back up your Mac with Time Machine:

https://support.apple.com/en-us/HT201250

❗️ – IMPORTANT – 32-bit apps won’t work in Catalina or Big Sur.

Use this free utility to check the compatibility of your apps:

St. Claire Software – Go64: https://www.stclairsoft.com/Go64/

📚 – Check Compatibility of your Mac with newer versions of macOS.

How to upgrade to macOS Big Sur – Apple Support

How to get old versions of macOS - Apple Support