A Shopify forum is an online community, and, as with any online community, there is a central common interest that ties the community together. For a Shopify forum, that common interest is your Shopify store and its products and services.
On a Shopify forum, you might find very different information depending on the type of Shopify store where the forum is located. For example, a SaaS company on Shopify might run a forum that mainly discusses how to use their software. In contrast, an art supply store’s Shopify forum may ask and answer painting-related questions.