What are the fundamental beliefs of Ahmadis?

True that understanding is important than hifz but for a person to become a scholar its an obligation to memorize it in traditional Islam....Ahmadis are claiming Mirza to the "shadow" of Prophet(SAW) and the shadow doesn't even know the Quran by heart. If Mirza was divinly guided then it wouldn't be difficult for him to read Quran just by memory.