1. Enable HTTPS encryption:- This feature, which encrypts data transferred during Facebook sessions, is designed to prevent attackers from compromising users’ accounts. To do so, go to your Account Settings > Account security and enable Secure Browsing (https).
2. Enable Device detection:- To do so, go to your Account Settings > Account security and enable the feature which says “When a new computer or mobile device logs into this account”. Check on Send me an email.
3. Facebook privacy Settings:- This feature will help you to set the privacy of your Facebook Account. If you don’t want available to the public or don,t share your personal stuff with others here. Than this feature will help you to do this. To do this got yo Click Account > Click Privacy Settings and you will make the changes there like who can see your profile, pics, posts, and all.