Using a phone for photography has advantages and disadvantages over a dedicated camera. It's discreet and convenient, and allows immediate editing and posting of images. But it's also constrained by the limits of the fixed lens (unless you add hardware), ergonomics and sometimes imperfect software. Here are some techniques specific to photography on an Android phone.
Accessing Photos from other Apps
Camera apps and others that store images on your phone (such as import apps or photo editors) in different folders. Trying to find them from another app isn't always straightforward.
Which app to use for...
Sometimes there's too much choice and it's difficult to know (or remember) which app is best suited to a certain function, especially in editing.
Some of the greatest photographs have been simple but striking compositions, and simplicity is a great tool for creating images that work well on a small screen.