How can prevent hack my facebook account?

If you Login Into your Facebook on a Public Computer or a Device thats not yours make sure you Log Out when your Done 

Never Login Into Facebook using Proxy Sites a lot of people dont know this but using Proxy Sites gives your Login Information out to the Site owners who then can Steal it and Login into your Account and take over 

If you see a Suspicious Link dont click on it as a lot of those links can Contain Malware which can Steal your Account Information 

When your Logging into Facebook check the URL on the Top Make sure it says Facebook.com if it ever says something different dont login as it could be a Fake Facebook Login Page 

For Prevent hack hire a hacker from https://www.hakerlist.co/

You need to ensure that you choose a secure password, my friend. i.e. one that a combination of Upper case, Lower case, letters and 'special' characters, such as !"£$%^&*()_+@:~#';.

Make sure that you do NOT use words that can be attributable to you. i.e. do NOT use the name of your first pet, the car you drive, the school/college/university that you attend, where you work, the street that you live in, etc. etc.

Keep your password very safe.  Right now it is common for liberals to hack into someone's facebook account and send hateful racist messages to all of the contacts in the account.