From the CDC:
Person-to-person spread The virus is thought to spread mainly from person-to-person.
Between people who are in close contact with one another (within about 6 feet). Through respiratory droplets produced when an infected person coughs or sneezes. These droplets can land in the mouths or noses of people who are nearby or possibly be inhaled into the lungs. The virus that causes COVID-19 seems to be spreading easily and sustainably in the community (“community spread”) in some affected geographic areas.
https://www.cdc.gov/coronavirus/2019-ncov/prepare/transmission.html
1. Droplets: How many people sneeze or cough on others or allow someone else to sneeze or cough on them? Probably not many. IMO, least likely.
2. Surfaces or personal contact: IMO, most likely. Someone sneezes or coughs into their hand, then shakes hands with someone else. Or coughs or sneezes onto a surface that someone else touches, then transfers infection into mucus membranes.
3. As far as I can tell, no one is saying that it is airborne like the measles are. Is this what you are thinking?
But the point is, we know it gets transferred from person to person. How and which method is the most prevalent are probably not known yet.