BDAG is exhaustive. It cites not only every occurrence of a word in the New Testament but also references the Septuagint (Greek Old Testament), the Apostolic Fathers, and secular Greek papyri. This allows the user to see how a word was used in legal documents, personal letters, and receipts from the same time period, grounding biblical vocabulary in real-world usage.
It looks like you're asking for a guide on — but this term is ambiguous without more context. Below are the most common meanings, each with a quick guide. Please check which one fits your situation. BDAG is exhaustive