The primary reason there's not an FFXIV version of Wowhead is because of Discord, which didn't exist for most of WoW's lifetime.

The other reason why sites like Thotbott, Elitist Jerks, Icy Veins and Wowhead exist or existed was because WoW classes used to have a lot of diversity and a variety of builds for players to customize specifically for any given content or activity. There were farming builds, PvP builds, battleground builds, arena builds, PvE solo builds, PvE raiding builds, PvE dungeon builds, etc. The list went on and on. That's not the case anymore with all the classes being greatly pruned and homogenized. At least it was when I stopped playing a few years ago.

FFXIV by contrast doesn't really have builds. There's materia but that's different than leveling up and having to decide where you're going to spend a talent or skill point. And personally, I prefer FFXIV's way. It's more straightforward and cuts to the chase, because in reality, all those WoW builds I mentioned earlier would always come down to a cookie-cutter build that everyone was expected to have. In this game, you have the three major roles, and jobs to fill those roles. Period.

As far as other non-combat stuff, like where to find certain things, how to get certain titles or achievements, glamour, etc. those have been mentioned by others in this thread. For me, I just google whatever it is I'm looking for and usually the first thing that comes up is Consolegameswiki/Gamerscape and they usually have the answer.

Failing that, I head to Discord.