How to upgrade from macOS High Sierra to macOS Monterey?

Back up your data, check your applications for compatibility, click here, and depending on which Mac model you have, then on the download link for Mojave, Catalina, Big Sur, or Monterey; it needs to be at least a 2012 one, or a 2010 desktop Mac Pro upgraded with a Metal-capable graphics card, to run any of them. If you get a Mac App Store preview page, change the https at the beginning of its address to macappstore.

Catalina and newer won't run 32-bit software; download and use Go64 to scan for it. To look other programs up, click here.

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Some users have not successfully upgraded to Monterey from other than Big Sur. I recommend incremental upgrade first to Mojave, then Catalina, then Big Sur and finally to Monterey.

Make sure you backup before upgrading since problems sometimes occur.

You need at least 26GB of free disk space to upgrade.

i have to second lllaass' recommendation. i too feel that it's better to NOT skip past those other macOSes but rather step up one macOS at a time.