a privacy question about facebook

[Kelsey]

I was wondering, how can you make your facebook account only viewable to your friends instead of anyone and everyone being able to see it? and is there a way that will make your profile picture only viewable to friends too? as in random people who search you up won't be able to see your profile picture but only your friends could. also, how do you block people on facebook? i really need the answers to these question, thank you! any helpful answer will be very much appreciated. thx!