Shoppable posts explains the direction that Instagram is taking in the future with their platform. Understanding this feature (concept) will allow you to position yourself and your business both now and in the future. It will help you focus on the quality of your offering while spreading yourself across the market without having to write a clever headline and gamble on thousands in advertising.
There is a disclaimer here that I do not work for Facebook or Instagram, please take some of this information as speculative. To help you understand my position, I am an ex-hacker/social engineering expert who has focused on reverse engineering the business models of Facebook, Google, Amazon, Tesla and other major companies. My opinions and information are built on core knowledge and information and for niche information sources, is completely factual.
The understanding for what is available should be broken down into what is available for you right now along with a play on where we see the future technology and business structure headed.