It is no secret that the ribbon in just about any major application is beyond useful. But the chapter about features and tools that are in other menus not found in the primary ribbon most definitely takes the cake for "Best Features to Know About". Knowing about extremely helpful short cuts and things of that nature in almost all software can make you far more efficient. If you repeat a simple task enough times but are able to do it in a fraction of the amount of time can end up saving hours upon hours of effort.
There isn't too many exciting things to show for such a topic but I did manage to find a potentially helpful video about iPhone shortcuts.