The answer to your question is the title of the poem.
I am not 100% on this but crest is usually associated with a wave so if there is an answer for a wave I would go with that
Simple....
A few good ways to talk about yourself--->>>
To mention a few things...you could talk about your personality, your hobbies, what kind of a person you are (charismatic, intriguing), what you love to eat, your family, just you in general; don't be shy...it's you you're talking about, and you know yourself more than anyone else!
Thus, your answer.
C Mesopotamia they turned it into a language