First, learning first aid is important so that one can help save lives in emergency situations. First aid involves providing initial assistance to someone injured until they can receive medical care from a doctor. It aims to preserve life, prevent conditions from worsening, and promote recovery. The key steps of first aid are to quickly assess the situation, ensure your own safety, call for help if needed, give prompt treatment, and help arrange evacuation for medical care. Proper techniques include checking breathing, pulse, temperature and other vital signs, providing CPR if needed, controlling severe bleeding, and caring for the injured person until they can receive further treatment.