At the beginning-algebra level, the rule is "every Real number raised to the power of zero equals 1".
When you enter advanced-algebra or precalculus courses, this rule changes somewhat to "every Real number raised to the power of zero equals 1 except for 0^0, which is called an indeterminant form". (This is because mathematicians have not settled on a definite meaning for the expression 0^0.)
So, at your current level of studies, I say that 0^0 = 1. Additional inquiries about this should be directed to your instructor, if you desire further insight with respect to your course.