I love freebies. Picking one up is liking buying something nice, only without the cost. For a limited time, you can download a free copy of Android Photography by Colby Brown. It's a simple primer for learning how to take photos using a, preferably stock, Android phone or tablet.
The basics, and I do mean basics, are covered here. The book opens with a description of the best way to hold a phone for both horizontal and vertical pictures, and while this may seem obvious to some users, there's no shame in admitting if your picture-taking form could use some work.