Virus spreads from person to person through droplets. Droplets spread through the air via cough or sneeze at a distance of 1-2 meters, after which they fall quickly to the ground. The virus doesn't remain airborne. The virus can't be transmitted through skin, like the skin on hands for example, but the virus does spread through mucous membranes, typically those in the nose, mouth and eyes.
One is typically infected by being close to someone who excreting droplets, for example through hugging, coughing or sneezing, where the droplets land on one's mucous membranes in the nose, eyes or mouth, or by touching surfaces with virus on them and proceeding to touch one's nose, eyes or mouth.
We don't know for sure yet if those who are infected can spread the virus before they have symptoms. The knowledge we do have shows that people with symptoms are the cause of the vast majority of new cases.