Can you tell me how to prevent infection of a cut?

Use good wound care.: Stop bleeding by applying pressure. Rinse wound w clean water. Clean surrounding skin w soap & water on wash cloth. Remove debris w tweezers. If material remains in wound – seek medical care. Apply antibiotic ointment. Initially cover w bandage until some healing has occurred. Change bandage when soiled/ wet or at least daily. Need tetanus shot if you haven't had one in last 10 years, don't know

Clean with: non perfumed soap and water daily, keep moist not wet with antibiotic ointment and covered until healed. Prevent reinjury and DON'T leave it "open to the air".