Honestly, all the lore is interesting, all of it can be tied together in some way, and reading other parts of the lore can help clear something else up. I know it’s cheesy and not exactly helpful, but I’d say just find the Ishtar Collective and start reading about anything that sounds unfamiliar or interesting. As for humor, the Lord Shaxx grimoire cards (there’s two of them) are pretty good, as is the Cayde-6 card. A lot of the Iron Lord grimoire cards end up being funny, too, if you’re in to darker humor (Gheleon is the one that jumps to mind). Some of the cards about the First Crota Fireteam can also be funny if you’re a horrible person like me because they’re cracking jokes even though they’re about to die horrible deaths.