How do I update my MacBook from macOS High Sierra?

Whether you can upgrade from High Sierra, and how far, will depend on which Mac you have.

What does it say about your Mac's model and hardware release year / time of year in the About This Mac dialog in the Apple () menu?

Back up your data, check the application compatibility table, click here, and if your MacBook is a 2012 or newer model, then on the download link for a newer OS.

Catalina and above won't run 32-bit software and split the functions of iTunes up; if you choose one of them, use Go64 as well.

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