head to

رفتن به جایی

Go to school or heading to school. . both of them means the second ( in first sentence you arrive school 99℅ but second sentence means
, that maybe you cannot arrive at school

سر زدن. ی سری هم به فلان جا زدن

Go to somewhere

You want to go to somewhere but you arent 100 percent sure.

رفتن ب جایی
مثلا
Head to English class
رفتن به کلاس انگلیسی