Books on Sunnah

When I visit https://sunnah.com/ , I see a list of various hadith books that contains the sunnah of the Prophet Muhammad. My question is how are these books different from each other? As per my research on the books on this website, Sahih-al-Bukhari is the oldest one compiled around 846 CE and was closest to the timeline of the Prophet Muhammad. So as per my understanding, this should be the accurate one and most trustworthy. Please correct me if I am wrong. Is it like some of these books contain hadith that are not part of any other books? Or does all the books contain the same hadith? Please clarify!