To learn and practice Chen-style Tai Ji Chuan, the first choice is old Lu Jiayi, which is the basic boxing method, also called "Kung Fu Boxing". It's best not to watch it on video, because video is for people to appreciate, not to teach. If you have a certain foundation, it is ok to look. After all, there are some obstacles in self-study, but not everyone can't learn. Tai Ji Chuan, who taught himself, definitely lacked some connotations and essentials of Tai Ji Chuan. You are right to watch Chen Zhenglei's video. You can buy Chen Zhenglei's Chen-style Tai Ji Chuan Old Lu Jiayi teaching CD from a systematic or related bookstore, which explains it clearly. At the same time, you can buy Chen Zhenglei's Chen Tai Ji Chuan book. First imitate the action structure, and then compare the text description in the book to gradually improve each action. You must know the structure of each movement, so that you won't sprain your joints and get hurt during the learning process, and then you will gradually enter the content of self-study. When you have a certain degree, you should ask a master to guide you and correct some incorrect actions in time, so as not to be difficult to correct after a long time. As for Gong Zhuang and footwork, there is a clear introduction in the teaching CD. Self-study of Chen Tai Ji Chuan must pay some spirit and efforts. I wish you success!