Under Windows 10, you could also open Cortana with Win + F18. I have heard that some laptop keyboards had dedicated Cortana keys that sent Win + C instead of Win + F18.

Press F10, and small letters appear over each ribbon tab and quick access toolbar item. Alt+H takes you to the Home tab, Alt+N to Insert, and so on. Once in a tab, additional letters appear for ...

The Fn key is also known as the function key, and on Windows and most Mac keyboards, you'll find it located in the bottom-left corner of your keyboard.