For learning system administration, I think Cent OS Stream can be a great choice. Not because it offers something special than others but because it would familiarize you with the RHEL/Fedora family and in my experience majority of enterprise-servers are using one of its family members, be it RHEL, the former CentOS, Oracle Linux, Amazon Linux or some other variant.

You got me scratching my head there ngl. If by inline expansion, you mean to say being able to show image in full size without clicking into details of the post, then I am seeing it’s already there. And so far I haven’t tweaked any UI settings on the website.