I try to teach physics and mathematics easily. I try to explain everything clearly then I give a lot of examples ad try to make the subject so simple for my students. Then I ask the student to explain the lecture to me. I would like to be sure the student fully learns the lecture. Next day I review the lecture again. After two days I will ask student to repeat the lecture to me. Next week I ask again and then after two weeks I review it again. I wait for one month and after one month I try to review the lesson again.