Ignorant about VFS. Can you help?

  1. What is the difference between Vocal feminization surgery and tracheal shave? Is it the same (does shaving tracheal lead to voice feminization) ?
  2. What are the methods in VFS? Which one is the best and which one did you choose ?
  3. If VFS is different from tracheal shave, why do we need to shave trachea ?

Thanks in advance.