The difference in "Best Friend" with "Friend"

The meaning of life actually is when we could feel the happiness gained from Pray, work hard, and share. so people will smile with all that we stand for... But among them (Best Friend) there is also that comes when our lives have changed much more better than the previous, and that's the so-called "Friends".
So be careful with the name of a "Friend" or is more worthy of it's called "Fake Friend"