Although the tips are demonstrated with an iPhone, most of them also apply on the iPad (not 7, 11 nor 13). I encourage you to actually try each of the demonstrations yourself, using your iDevice. I’d love to hear which one is the most useful to you. Tell me in a comment or in the hallway. I never knew that you could use the timer to stop music, a podcast, or whatever you’re playing! I also didn’t know about using the compass as a level.
Bonus: Enable the “.” shortcut to automatically enter a period using a double space.
And now, for the 14 tips, from PandasCanEatYourTech: