There’s a really excellent ogrynomicon-level veteran guide pinned on the official discord, with an update being written by path.exe. Psykers have the Atheneum guide by Pygex on Steam.
Zealots… Don’t really believe in all this being clever stuff.
Edit: I would also add that Kuli has a Steam guide for each talent tree which looks into the game code to reveal what the tooltips don’t tell you. Essential reading.
Edit edit: I don’t normally post links but here goes.
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Veteran Guide by path.exe Discord
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Psyker Atheneum by Pygex Steam Community :: Guide :: The Psyker Atheneum