To install Steam on most distros with popular DE’s, you click the software store to open the software store. If Steam isn’t listed in the front page then just click the search box and start typing Steam.
When you see it, click the install button.
When it is done open it by clicking the Open button or pressing the Windows (or Super) key and type Steam. Click it when you see it.
Different person here but I’ve been using Fedora for many, many years. This discussion comes up all the time and though RPMFusion is a checkbox in the software store GUI people obviously would like to have Nvidia proprietary drivers and proprietary codecs as an easy install like from a button click on install.
The problem is that Fedora has had a FOSS only core value since the beginning and I’m sure a big part of that is to keep Redhat out of legal troubles but it also resonates with a lot of the actual Fedora volunteers (those folks on the SIGs that do all the work).
I don’t think it’ll change anytime soon. Normally the response to this is “then new users will go elsewhere” or “If Linux wants to (something number of users or something market share)”. The thing is the Fedora project doesn’t ‘care’ about that and why should they?