For TTT, I think the most cost-effective course is actual combat. At that time, several of our internal trainers took part in the actual combat class of Shengde Ye Zhi. The effect is very good. After I finish studying, I will send out training materials every month, and I will often use them in every lecture. Moreover, the most important thing is to be able to participate in retraining. Every time I ask their lecturers with the questions I have saved, I gain more than before!