To help you understand better principles of OpenStreetMap, we would like introduce you some external sources. Interesting materials about OSM are published on http://www.vimeo.com. This short video demonstrates how to trace roads, paths and areas from Bing aerial photos, and add them to OpenStreetMap (using the in-browser editor, Potlatch 2).
OpenStreetMap for Beginners Part 2: trace roads and areas from David Ellams on Vimeo.












