Which sentence is correct between these?
Where will you go?
Where you will go?
Number 1 is correct.
When we construct a statement -- not a question -- in English, we normally phrase it subject / verb / object. Like "You / go / to the store." When there's a "helping verb", like "will" or "do", it goes with the verb. "You / will go / to the store."
But when we construct a question in English, it's normally "interrogative word / helping verb / subject / regular verb / object". By "interrogative word" I mean a word like who, when, where, how, etc. So, "Where / will / you go?" "Why / did / Bob / leave?" Etc.
They are both correct depending on the context in which it is put.
EXAMPLE Question: Where will you go? Answer: London.
EXAMPLE John: I don't know where I will go Mabel: Where you will go?
In questions you have inversion of subject and verb, i.e. the subject is in position 2:
Are you British?
Have you seen it?
Can you talk English?
Do you understand me?
In questions with question words the subject is in position 3:
Why are you here?
When did you see it?
Why have you done this?
Who can we trust?