In the old forums it was possible to upvote a post as being a helpful post. Is this functionality present in the new forums (geonet discussion boards)?
The link to that document has changed. Here is the new one: How to help in the GeoNet Community
I suppose that is what the rating thing is supposed to be for. A little bit like the thumbs up/down of liking, but allowing more specificity.
Since you can also like, bookmark, share, and follow things can be a bit confusing...
This explains how to use the various options in GeoNet:
How to help in the new GeoNet Community
Retrieving data ...