Rationality can be broadly broken down into "epistemic" and "instrumental".

Instrumental rationality is broadly about Winning. It further breaks down into "deliberation techniques — for identifying your better courses of action — and implementation techinques — to help you act the way you've decided upon." For example, meta-ethics, fun theory, the science of winning at life, decision theory, utility, Utilitarianism, game theory, thinking strategically, beating akrasia, challenging the difficult.

Epistemic rationality is broadly about being curious, map and territory, the meaning of words, understanding and feeling truth, having good beliefs, reductionism.

And some ideas that span across both, like how to actually change your mind, heuristics and biases, defeating rationalization, living luminously, priming, positivism, self deception, and neuroscience.