How can I update macOS High Sierra 10.13.6 on Mac?

yes, that helps. that Mac can be upgraded up to and including macOS Ventura. I would recommend at least upgrading to catalina before trying to get to Ventura, as high Sierra directly to Ventura might be too much of a jump. and if you have the time, it may be wise to upgrade one macOS at a time all the way up to Ventura.

please see How to download and install macOS - Apple Support

and Update macOS on Mac - Apple Support might be helpful.

we need to know the model year of your iMac to determine wether or not you can upgrade past high Sierra. please use Apple Menu > About this Mac and let us know what it tells you.

If you upgrade to Catalina or later,

• 32-bit applications will stop working
• iTunes will go away, replaced by separate applications (Music, TV, Podcasts, Books), and Finder-based (iPhone, iPad, iPod) management.

Note that Ventura is the only version of macOS that your system can run that is still among the "most recent three" that vendors like Microsoft and Adobe support.