how can install latest macos on 2011 macair
gud evening i am using mac 2011 how can i install latest version
MacBook Air 13″, macOS 10.12
The model year of a MacBook Air is available at Apple menu > About This Mac.
A late 2010 through mid 2011 MacBook Air can be upgraded to High Sierra 10.13.6 but no later version. See: How to download macOS - Apple Support