Each social media has an implicit purpose. The stronger ones have a purpose that is clear. Facebook: stay connected to family and friends; LinkedIn: connect with employees/employers. For Instagram, the purpose is advertising. For most people, it is advertising your life. For certain people, with many many followers, it is advertising products.
To get a sense of how much Instagram is about advertising, see this: Confessions of an Instagram Influencer – Bloomberg. While many of us are amateurs at advertising on Instagram, this article will show you how the pros go about it.
I have often looked at people Instagram proposes I follow and I have wondered why people take the photos they do. This article helps explain that. It also helps one understand why some people’s photos look nothing like yours.