Much of this is common sense, just saying it for the sake of saying it since (speaking firsthand) it's easy to overlook simple things when you're really focused on making a good impression with a new group and following strategy
If you're slightly-ish undergeared then you'll probably be in the abom on putricide, may want to check vids from that perspective if you haven't. It's not hard, just priority management and awareness.
Be super careful with threat on Festergut once you get bloat stacks, it's really easy to rip off the other tank without trying.
My healers like it when I 3-count taunts on some of the harder hitting bosses that have to be taunt-swapped so they can preload stuff on me; many of the fights are binary, one tank or the other needing most of the healing attention, so that little reminder is good to keep them from getting caught off guard (cooldowns help of course, but sometimes I'm saving those for something specific).
BQ requires two "tanks" for the blood mirror mechanic, but the OT is only taking shadow damage based on the physical damage the MT took after mitigation, and doesn't have to stay #2 on threat for any particular reason. Go dps mode and just wear your stam gear so you can take the shadow hits if you're the OT.
Careful with hammer/consecrate timing on DBS.
Everything else is pretty elementary I think, or is dependent on your guild's methodology.
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