For the life of me I can't find single ESET guide that describes how the things works. They are like the joke for Windows' HELP - Extremely accurate but equally useless.
Here for example we have the Learning mode. The only description is few lines, containing nothing specific:
Automatically creates and saves rules; (ok. We know that from all other vendors) this mode is best used for the initial configuration of the Firewall, but should not be left on for prolonged periods of time. (Again we know how those modes works) No user interaction is required, because ESET Endpoint