How do you curl your hair?

Being a girl with a curly hair lately is such a trend that could be useful in my opinion, I mean for our whole lives we were suffering from straightening agony and for a long time we were convinced that it's the perfect condition of the hair and we all should get along it.
ANYWAYS, When you see a girl with a nicely done curls, all it comes to your mind is "How do you curl Your hair?"