>>3326178Don't bother with this "parasitic light" nonsense, your phone has a tiny sensor and it's going to need all the light you can feed it for a quality image. You should be instead thinking of how to maximise light if anything, like a ring light to hold in your free hand.
Here's a helpful cheat sheet to get you started.
First off, creative photography is about manually adjusting shutter speed, ISO and aperture. The best way I can describe shutter speed is choosing creatively if you want a blurry or extremely sharp image. Imagine photographing a bird in flight, you need the shutter speed to fire fast enough to freeze the bird in flight. Now imagine you want to capture the blur of a busy street. In that case you'd slow your shutter down to capture the blur of people walking around.
Same with ISO, ISO 100 is usually the "cleanest" image you can get with very little noise or grain but if you want to speed up your shutter speed or close your aperture sometimes you need to raise your ISO for more light sensitivity on the sensor allowing you the freedom to have faster shutter or a deeper depth of field. You should be thinking "is it worth a little grain to freeze this action?". Sometimes it can be.
Aperture is dicey on phones since they tend to have a single aperture like f2.8. I'd look into that more if you ever upgrade to a real camera. Basically it's opening or closing the blades on the lens to allow in more or less light which impacts the depth of field (how far away the image is in focus).
Anyway, play with this the best you can and learn how the three interact with each other. If you can turn on a rule of thirds grid on your phone, use it and play with framing. Like
>>3326196 said, look for leading lines and imagine guiding the eye around your image. People don't look at an image all at once, they dart their eyes around taking in little bits and pieces at a time. Use that to your advantage. 
