There is no specific treatment. It is mainly supportive treatment that aims at reducing symptoms.
One common piece of advice for avoiding infection is to behave as if you are already infected, and are trying to avoid transmitting the virus to others.
Both healthy and infected people can use eye protection (glasses/sunglasses) as well as face masks to block outgoing and incoming droplets.
The most effective way to prevent transmission is by self-isolating and avoiding unnecessary contact with other people.
A face mask offers protection in 2 ways: it protects other people by preventing any droplets from you, and it protects you from other people who are not wearing face masks and project their droplets onto you. When someone talks, coughs or sneezes they spray small liquid droplets from their nose or mouth which may contain the virus. If you are too close, you can breathe in the droplets, including the COVID-19 virus if the person talking, coughing or sneezing has the disease.
Wash and/or sanitise your hands as often as possible. Washing your hands with soap and water or using alcohol-based hand rub kills viruses that may be on your hands.
Stay at home as much as possible. Avoid crowded areas, and keep a minimum distance of 2 m away from people not from your household.