The answer to this question is "Similes". The given except taken from the writing entitled "Spanish Dancer", the author named Rilke compared the dancer's arm into the snakes and this is an example of Simile which is about comparing. A simile is comparing things with same attributes.
you got this. don’t doubt urself! it’s challenging towards everyone to learn a new language so your totally fine! put all your effort and dedication into it and you’ll get the hang of it as you go.