Bok Choy, a prominent FFXIV raider, recently wrote up a breakdown of tanks in Shadowbringers that’s a great comparison of each tank and the similarities and differences in their ability sets. I got Gunbreaker to 70 last night, and a tank is probably my next thing to level to 80, so I’ve got tanking on the mind.
GamerEscape’s FFXIV Gear Set List is a comprehensive list of armor sets available, sorted by name, job, and a few subcategories. It’s very helpful for seeing what a set looks like before you have all the pieces handy, so you can decide whether it’s worth collecting or not. XIV Style was my go-to site until recently, but they’ve not updated in several months and are missing the most recent sets of gear, including the last sets of dungeon gear from Stormblood.