My first OS was whatever ran on a Commodore 64. I guess the Commodore kernel and Basic?
My first distro was whatever version of Fedora was current in the fall of 2008. I'd gone to university that year and my laptop crapped out. Couldn't afford a legit Windows license at the time to replace it, and I'm pretty sure I just remembered that Red Hat was a thing and found Fedora that way. One thumb drive and 16 years later, still using linux, so I guess that was about the only good thing to come from my abortive first attempt at higher education.
Almost all, except for the oddball that is Strange Journey, taking place in post-apocalyptic Antarctica, instead. It has a lot of elements that differ from other Mainline entries, but Atlus treated it as such and acknowledged it with the recent Mainline 25th anniversary celebrations. I really enjoyed it and think it's worth a playthrough, but it may not be the best starting point. I also don't know how the remake holds up, I've read complaints about changes online, but SMT fans can be a bit touchy about their favorite games.
I'll disagree on this one and just add that not everyone who enjoyed 4 found Apocalypse to be that good. From what I saw, people that really just love the battle system and doing things like building out the perfect team for tackling boss rushes and insanely challenging super bosses really enjoyed it. If you go in expecting more of SMT IV's world and story, you may well be disappointed by it. I found the characters to be unlikeable, personally, and it seemed like an unnecessary rehashing of the story. I also recall some unavoidable boss rushes in the main story that made certain areas really grindy and killed my enjoyment for a good while.
Otherwise, I would say a pretty decent write up here.