Some friends are from your workplace. You have a relationship with them but you don't talk outside of your workplace. Then you have the good friends. The good friend will be with you until you die. You can share your thoughts and life with the great person.
The sincere follower of Jesus needs to be careful with people. They need to befriend everyone but not everyone should be a best friend. I have some good examples.
If you are a follower of Jesus and you have a friend. The friend control what you do. They like to drink alcohol and get drunk. If you get drunk then you should not be their friend.
If you have a problem area and the friend wants to tempt you with their sin. Then you should not be their friend because you are a bad witness. Everyone needs to answer this question.
You can befriend them but don't be their best friends.
Many people are raised in a Christian home but their friend are bad. The friends promote sin and the kid will astray from the Lord. If a person desire to follow the Lord then the person needs to reject sin and follow the Lord. This is not easy but the Lord should be more important.
If I see the friends of a person then I can see what type of belief they have.