Hi, welcome to the forum, your symptoms of common cold may be due to infection or allergic rhinitis. Some viruses causing infection are rhinovirus, adenovirus, echovirus etc. Infection is transmitted through inhaling droplets and touching infected areas.
You should take rest; drink plenty of water, salt water gargle. Antibiotics, antihistamines, cough syrup will help you but to be taken against prescription. Identify the environmental factors you are allergic to like dust, pollen, pets etc.