Security guards are responsible for patrolling, protecting, and safeguarding areas and people to prevent harm, illegal activities, disturbances, or violations of rules. Their main duties include securing areas and personnel through patrols and monitoring equipment. Effective security guards have skills like preventing robberies and losses, documenting incidents, following rules and regulations, communication, problem solving, and public interaction. Most positions require a high school diploma or GED, passing a background check, and obtaining any required state licensing.