The wiki page gives a decent explanation, including pumps, shop, surroundings, etc.
OpenStreetMap community
Everything #OpenStreetMap related is welcome: software releases, showing of your work, questions about how to tag something, as long as it has to do with OpenStreetMap or OpenStreetMap-related software.
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Join OpenStreetMap and start mapping: https://www.openstreetmap.org.
There are many communication channels about OSM, many organized around a certain country or region. Discover them on https://openstreetmap.community
https://mapcomplete.org is an easy-to-use website to view, edit and add points (such as shops, restaurants and others)
https://learnosm.org/en/ has a lot of information for beginners too.
Thanks, that did help somewhat. However, it's still a bit ambiguous with 'add a node at the center of the fuel station...' not being clear if that means the building or the pumps or the entire property. (I've seen it all three different ways on OSM), and, of course, it then goes onto say "or create a way around the fueling area." The term 'fueling area' makes me think it may mean the pumps? That's not all that clear again, and I've seen it different ways. I suppose both are okay then, but I was thinking there would be some accepted consistent way to do this. Likewise, for the convenience store it gives both the option of adding a node in the middle of the building and marking that as the convenience store or mark the building itself as the a convenience store.
Sounds like all those options are okay. I suppose I was just being a bit too pernickety about it and wanting there to be a perfectly consistent way to do this.
Decision of micro-mapping a gas station is a matter of how detailed you like it to be and is indirectly asking who will benefit from those details in &OpenStreetMap.
If you think of a large station, it could be made of pumps, shop, technical buildings, parkings, picnic sites, decorative grass, bushes, flower beds, etc.
Then, it becomes clearer the filling area is that: the filling area. So, shop, picnic sites, grass, etc. are part of the gas station but not of the filling area.
Where that area exactly starts and stops is your judgment call based on visual clues like curbs, painted lines, differences in ground surface and elevation, etc.
Okay, that makes sense. Thanks.