You can make your Facebook account more secure by using two-factor authentication. Two-factor authentication is when you enter your Facebook password and Facebook sends an OTP code (message) to your phone. And only after entering that code you can open your Facebook.
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If you want to use this feature just go through my article of how to how to enable two factor authentication to secure your Facebook Account. First you need to go to your Facebook settings and select the Security & Login option. It has an option called Two Factor Authentication and go to Use Two Factor Authentication.
Now there is a choice to use Google Authenticator or SMS. In that we suggest you to choose the option of SMS.
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Keep in mind it is a little easier and more secure. Now put your phone number there. Then the OTP code comes on your phone. And put the same code in the box there. After doing so, two-factor authentication is activated on your Facebook.
From now on, you will have to use OTP code when logging in to Facebook on any new device. In this case, even if someone knows your password, they will not be able to open Facebook without the OTP code.