A person with A blood type can receive blood from a donor with
A blood type patient can be transfused with O blood type as the patient's antibodies cannot agglutinate RBCs of the donor.
O blood type people have anti-A, B antibodies.
A blood type people have anti-B antibodies.
AB blood type people lack antibodies but they have antigens A and B which can illicit immune response in the A type recipient. Note that AB type are universal acceptors not donors.