1. what is the best method to learn cpr?
a: you should take an accredited first-aid training course that includes cpr and also how to use an aed.
2. identify the cab’s of cpr, and describe the meaning of each letter below in a complete sentence.
c – c stands for circulation; to restore blood circulation with chest compressions.
a – airway is what a stands for and it means to clear the airway.
b – b stands for breathing for the person

"A: You should take an accredited first-aid training course that includes CPR and also how to use an AED" is the best option because these classes will have more resources than you'll be able to find on your own. 

CPR or Cardiopulmonary resuscitation is a process or technique used to save lives during emergency situation wherein a person’s breathing or heartbeat is compromised. This could include, drowning or a heart attack. It is a technique or a skill that needs to be learned, not just by the theories that comprises CPR but also the proper way of executing it. It would be better to take an accredited first aid training that covers CPR and how to use an AED because it will include both theories and practical lessons. Remember, you will learn the proper way of doing CPR if you are able to pratice it or apply it during training.

Sector is best defined as (part).