In the 4 part tutorial series by Kernon Dillon that these files are for, review some of the most common modeling tools and techniques while building an awesome urban stairway scene.
https://youtu.be/yT-hg68L8VM
Topics include snapping, separating objects, beveling, linking object data, aligning objects, the spin tool, custom widget orientations, edge control loops, 3d cursor, array modifier, tapered extrusions, and much more!
thanks!!!