dca603d2_MacInfo___Efficiency__What_to_do
[Task] Knowing how to switch between windows of the active application [Example] inspecting several large images [What to do] 
If windows of the same application hide each other, e.g. a set of large images viewed in Photoshop, use -~ to rotate in the windows of the active application. There is usually also a Window menu which lists all open windows.
MacInfo - Efficiency
What to do