How does COVID-19 spread?
The COVID-19 pandemic spreads through touch points. (mouth, noise, eye) and spreads badly in high population communities due to lots of touching of surfaces. Particles end up on those touch points when someone coughs or sneezes. What we all need to do is ensure that surfaces are keep disinfected to minimize the spread.
An aggressive virus like COVID-19 can live on surfaces for several hours or days, depending on the surface material.