2. Beginners in Tai Ji Chuan mainly have correct posture. And it conforms to the concept of Tai Chi Chuan. For example, the ten essentials mentioned in Taiji Biography.
Tai Ji Chuan beginners had better leave breathing alone. That is: let nature take its course.
4. Learn from Tai Ji Chuan. Generally speaking, the current practice method is: first learn routines (one by one slowly), then add standing piles (moving piles and static piles), and then practice routines. Then learn to rub hands, then learn knives, swords, poles, Sanshou and so on. Learn more systematically.
So when you start to learn routines, you should learn the key points of each movement clearly, and then learn the next one.