How old are you? Do your parents claim you as a dependent? What type of degree are you working on?
If you are under 24, you generally can only claim the non-refundable portion of the AOTC if your parents do not claim you. This means you would need to have a tax liability in order to benefit from the credit. You cannot claim the refundable portion if you are under 24 unless special conditions apply.
You can take this for an unlimited number of years
Twenty percent of expenses up to $2,000
Non-Refundable meaning this can reduce the amount of taxes you owe, but if your tax liability is less than the LLC, your tax will be reduced to $0 and the rest of the credit is lost.
Cannot be claimed as a dependent on any one else's return
As a Married couple, your income must be below $160,000 for the full credit and below $180,000 for a partial credit
There's a new urban myth among college students that says they can get a $1000 from the government just for filing a tax form. For most of them, they simply aren't eligible. A full time unmarried student, under age 24, even if you don't qualify as a dependent, is only eligible for the refundable portion of the American Opportunity Credit if he supports himself by working. You cannot be supporting yourself on parental support, 529 plans or student loans & grants. It is usually best if the parent claims that credit.
You cannot claim the (up to) $1000 refundable credit if you are, or can be, claimed as a dependent by someone else.