I found two very useful videos to visualize the spread of viruses and bacteria.
The first one, produced by Bauhaus-Universität Weimar, shows the airflow that is moved when coughing, and what is the difference between coughing in the hand, elbow, or in a mask, normal or surgical. There’s a big difference!
The other is from Mark Rober, again, a Youtuber who, if you read my other posts, I suggested many times. In the video he scatters a dust, visible only with an ultraviolet lamp, on the hands of three children, during a lesson at a primary school. At the end of the lesson he shows the spread of “bacteria” (actually only this harmless powder), and how it spreads with handshakes!