First aid is used to preserve life and treat accidental injuries until a person can seek further medical care. Some of the most common injuries that a first aid course covers are bone fractures, poisoning, head injuries, wounds, choking, and burns. Both in-person and online classes will cover these basics. Free first aid classes will teach helpful information but do not provide certification. Individuals who wish to receive formal CPR or first aid certification should ensure that any course they take can provide them with the credentials that they need upon completion.