If you enjoy taking pictures on your phone or tablet, you may start to wonder if you can go pro, or at least up your game and take seriously great photos. The free Polaroid University app can help you do just that, offering a kind of free course on taking pictures on mobile. This covers recording video too and guides you through hours of videos on the matter, organised into episodes. A lot of content requires paying for, however. Still, this is a great, interactive way to learn how to improve your pics.