First aid techniques are essential skills that can help save lives in emergencies. Basic techniques include CPR (cardiopulmonary resuscitation) for someone who is not breathing, and the Heimlich maneuver to assist someone choking. Knowing how to clean and dress a wound can prevent infection, while applying pressure can stop bleeding. In addition to these skills, it's important to recognize signs of shock, such as pale skin and rapid breathing. Keeping the person calm and warm can help. Always call for professional medical help when needed, as first aid is meant to stabilize a person until further assistance arrives.