In order to find out about Facebook hacking myself, I just did a quick research on Google. However, just by typing "Facebook hacking" on Google I was quite shocked at how easy it was to hack someone's account. There were so many websites that popped up that titled "easiest ways to hack facebook accounts" and there were also videos that kindly presented how to hack. Some ways that I have learned was Phishing, which was one of the most challenging ways but the most popular way of hacking. People create a fake login page in other words we are cloning the entire Facebook page. Another way would be tracking the cookie of the victim's computer. If we are using the same Wifi network as our victim then we would be able to exactly clone the cookie, which contains the information on the hard drive. In this method, we won't need to know the victim's password since by cloning the cookie, Facebook would think that the authentication was verified.
Reference
https://null-byte.wonderhowto.com/how-to/4-ways-crack-facebook-password-protect-yourself-from-them-0139532/