Covid-19 spreads when someone coughs or sneezes in someone else's direction without properly covering their face. The disease is spread through the respiratory droplets that come from a persons mouth or nose to another person or surface. You could be 5 feet away from someone, and if they sneezed in your direction, there is possibility that you could become infected with the disease.
Another way you can get Covid-19 is by touching a surface that someone who is infected has touched. If a table or doorknob isn't cleaned with some kind of Lysol or cleaner, the germs can stay there for hours, waiting for the next person to touch it.