I need to update my MacOS but do not know what is compatible with my MacBook

Back up your data, check your applications for compatibility, click here, and then on the download link for Mojave, Catalina, or Big Sur.

Catalina and higher won't run 32-bit software; download and use Go64 as well as using the first link above.

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If upgrading to macOS 11 Big Sur - be sure to verify it Qualifies

The link below will roved that information

macOS Big Sur is compatible with these computers - Apple Support (CA)

• MacBook Pro (Retina, 15-inch, Late 2013)
• MacBook Pro (Retina, 13-inch, Late 2013)
• MacBook Air (13-inch, Mid 2013)
• MacBook Air (11-inch, Mid 2013)
• MacBook (Retina, 12-inch, Early 2015)