The amount of knowledge that qualifies one to call others to Allah

Question : First. Peace be upon you. The second question is: What is the amount of knowledge that qualifies a person to call others to Allah the Exalted?

Answer : It has no fixed limit, because a person calls others to Allah with what he knows, based on the saying of the Prophet (peace and blessings be upon him) So the call is either that a person is qualified for it absolutely, which is the one who has much knowledge, or qualified in a limited way regarding specific issues, and in both cases a person calls according to his knowledge.