You can go to the local Red Cross to sign up for the "primary first aid" training, which includes the most basic first aid techniques such as cardiopulmonary resuscitation and trauma first aid. After completing the training and passing the examination, you can get the corresponding certificate. If you are in Beijing, Shanghai or Shenzhen, you can also find the training institution affiliated to the local emergency center or attend the training. However, at present, these trainings have to pay a certain fee.