These pages help identify your Mac model and the newest compatible operating system it can be upgraded to:

MacBook Pro https://support.apple.com/en-us/HT201300

MacBook Air https://support.apple.com/en-us/HT201862

iMac/iMac Pro https://support.apple.com/en-us/HT201634

Mac Pro https://support.apple.com/en-us/HT202888

Mac Studio https://www.apple.com/mac-studio/

Mac Mini https://support.apple.com/en-us/HT201894