I made a list at the start of the season when I was still pushing a bit in S1 gear:
I haven’t updated that thread in a while, and I might approach the fights differently now (Disc has had buffs since then, and the fights have gotten nerfed) but reading through it quickly it’s all still pretty solid advice boss-by-boss.
Fortunately I was only playing Disc at the time so it’s pretty much disc specific advice.