Open Facebook and tap your profile picture
Tap Settings and privacy
Tap Settings
Tap Audience and visibility
Tap Who can see your future posts
Select Friends (or Only me)
Tap Limit who can see past posts
Tap Limit Past Posts
Tap How people find and contact you
Set Who can send you friend requests to Friends of friends (or Friends)
Set Who can see your friends list to Friends
Set Who can look you up using the email address you provided to Friends (or Only me)
Set Who can look you up using the phone number you provided to Friends (or Only me)
Tap Public posts
Turn off Allow public posts on your profile (if shown)
Tap Profile and tagging
Set Who can tag you to Friends
Turn on Review posts you’re tagged in before they appear on your profile
Turn on Review tags people add to your posts before the tags appear on Facebook
Tap Blocking
Add any accounts you want to block