How do I check I am running a current version of an operating system (Mac)?

Refer to Apple's support page to check your computer model is supported: https://support.apple.com/en-us/HT210222
Run Software Update to check that your operating system is up to date: https://support.apple.com/en-gb/guide/mac-help/mchlpx1065/mac

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