1) First aid involves providing immediate assistance to an injured or ill person until emergency medical help arrives. It aims to preserve life, prevent worsening of conditions, and promote recovery.
2) When providing first aid, one should protect oneself and the victim, examine the victim to check for breathing, responsiveness, bleeding, and pulse, and alert emergency services.
3) Basic first aid treatments include controlling bleeding, opening the airway, giving CPR if needed, placing in recovery position, and monitoring the victim until help arrives. CPR involves chest compressions and artificial ventilation to keep blood circulating.