The most common mistake I see people make concerning photography these days is not treating their smartphone cameras like an ACTUAL camera. They do this because it's built into a phone, and it's easy to forget that it is a real camera, and now days you can do much more with it than just take snapshots and selfies. Remember, the best camera is the one you have on you, and lets be real, we all have phones on us pretty much ALL the time. So best thing you can do is to remember that you probably have a decent camera in your pocket, and treat it like a real camera. That means think about things for a second. Just take a little extra time to make an image and not just take a picture.
Here are the 3 super, ultra, most fundamental tips to help you get better images from your smartphone! These tips/rules definitely apply to more than just that though, they are the basics for any kind of visual art, be it photography, videography, painting, drawing, etc. These will help you improve no matter what visual art you're creating, but smartphone photography is a great place to start!