an exponent is how many times you multiply something by itself remember that x^2=x^2 times 1 when you have x^0 then that means x^0 times 1 and then since there are no x's, the resulting value is just 1
Any number to the power of zero is one. Think of it like this - a power is basically multiplying a certain number of the same integer together. So, if we multiply 0 fours together, we just get 1. Alternatively, consider it like this - 4 to the power of one divided by four to the power of one is equal to four to the power of zero, so 4/4=1 is 4 to the power of zero. Therefore, 4^0 is 1.