The knowledge page allows you to provide an AI character with pieces of knowledge it can reference to respond to requests it receives. You can provide knowledge from various sources, including PDFs, websites, etc.
To test the effect of the knowledge base on the AI character, you can have conversations with it.
Instruction vs Knowledge
Instruction is a piece of information an AI character keeps in memory and uses in responding to every request it receives. Think of instruction like a quick guide or cheat sheet; it is expected to be concise.
Knowledge, on the other hand, is used as a reference material. Not every piece of knowledge is used by an AI character in responding to requests. Instead, the AI character picks only the relevant pieces of knowledge per request.
Instruction can be used to tell the AI character to always respond in Spanish, for instance. Knowledge, on the other hand, can be used to store a manual or an encyclopedia, portions of which can be referenced depending on the request the AI character is handling.