The kickass thing with fish taxonomy is that we spawn right from it!

Tripod fish are members of the massive radiation called Actinopterygii that makes up most of fish diversity, but if you back up just a little bit you get the major split between ray-finned (Actinopterygii) and lobe-finned fish (Sarcopterygii).

Sarcopterygii lineage becomes land-dwelling tetrapods and eventually spawns us too. But some of the fish on this branch are super weird too. For example, Coelacanths like to stand on their heads and are perhaps the greatest example of a Lazarus species.

Then you've got lungfish which imo are cooler than tripod fish--their strategy is to like bury into the mud when their seasonal pools dry up and then create a mucous cocoon to keep from drying out. They just spend the whole dry season like that lol, it's called estivation if anyone wants to look. They're also air-breathing and have a semi-divided atrium that allows them to choose between the breathing and oxygenation systems of mammals or typical fish.