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this is a topic i've been heavily involved with because i still consider myself to be someone who prefers using technology at a very beginner friendly level, plus it's very good when a linux operating system makes you feel right at home when it has a modern desktop environment. this is why i really like gnome, its simplicity and usability is something available for everyone, for beginners and for a lot of other people, but if you had to, say, rearrange xfce or kde for someone who was an elderly person or an absolute beginner so that they wouldn't have any trouble using linux, how would you do it? (screenshot is my current linux mint desktop, very simple and extremely user friendly!!!!)
Yep! Okular is amazing, and it's available on Windows too. Install it for someone and they'll never bother you again about PDFs or EPUB documents, it's performant and everything works: printing, resizing, selecting text, searching, signing, adding comments. Never worry about paid PDF software or shady slow apps that keep trying to gatekeep features.