(If you look at the behavior of preaching from a broader perspective, then you will find that in daily work, the usage rate of this skill is actually far beyond your imagination. When you make a work report at the quarterly meeting, when you present the product plan to other colleagues, when you conduct skills training for new recruits, in these occasions, you need to say what you want to say concisely, clearly and accurately communication to the audience. And your performance on these occasions also affects the judgment of colleagues in the company on your work results and personal abilities, and further determines your influence in an organization. The course will be developed around the concept of "student-centered". The principles of design tell you how to prepare course materials, how to design the logical structure of the course, how to package the presentation form of the course, and teach you to create an excellent classroom through the "seven steps of teaching".)