You searched "what is self-knowledge" and landed here. Good. Here is the short answer and where to go deeper.

Direct Answer
Self-knowledge is the knowledge of who you really are -- not your characteristics, personality or history, but the consciousness behind all of that. In Vedanta, we call this atma-jnanam.
Going Deeper
Vedanta's self-knowledge is not about discovering your preferences or emotional patterns. It is about recognizing that you are limitless consciousness -- sat-cit-ananda. That changes everything.

The self-knowledge Vedanta offers is not psychological self-analysis. It is recognizing the awareness that is present before, during and after every thought, emotion and experience you have ever had.
self-knowledgeatma-jnanavedantadefinition
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