from training.npr.org: https://training.npr.org/2015/10/29/a-handy-guide-to-making-awesome-photos/
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A handy guide to making awesome photos
When you understand the three fundamentals of photography — content, composition and light — you can create better images.

A guide to making better images with your iPhone
It would be nice if we all had professional photographers in our pockets … but we just have phones.