How can I update my Mac to the latest?

Back up your data, check your applications for compatibility, and if your MacBook Pro model is recent enough, click on High Sierra, Mojave, Catalina, or Big Sur. It needs to be at least a mid-2010 one to run a newer OS.

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Latest one is Big Sur and you need a MacBook Pro 2015 at least.

What year is your Mac?

Here's a list of Macs and OS versions https://eshop.macsales.com/guides/Mac_OS_X_Compatibility