Hi Tutor, please explain in simple words. what are headnotes which we see in cases of lexisnexis and westlaw. why we use them and how we use them. 2. what are key numbers on westlaw why we use them and how. 3. how can we find relevant cases and stattutes which are related to our case on lexisnexis and west law. 4. what are binding and persuasive authority and secondary authorities. how can we find them which are related to our case. Note: I don't need articles on these topics. rather I want you to explain me in simple wording and teach me. Thanks