Example, using SSG with revalidate option

This page will always be rendered statically, but the static bundle may be built either when deploying the website (AKA "pre-built"), or on-demand.

When it is built "on-demand", the existing static version gets displayed to the end-user immediately, and a rebuild is performed in the background.
The next user who load this page will get the newer static version.

The max age of this page has been set to 30 seconds.

By using incremental static regeneration, this page is kept up-to-date automatically, based on how often users open the page.
Of course, a few users will see outdated information, but it's not really an issue here.

If you use NRN Admin and update the products there, then when you refresh the page (once the delay of 30 seconds has passed) then the whole page will be statically regenerated.
And then, you'll have to refresh once again to see the new static version.