To prove there is product market fit while taking on the least amount of risk possible.
What problem does your product solve?
Who is having this problem?
How big of a problem is this?
How are people solving this problem now?
What is your unique value proposition?
Make sure you are only including features that will allow you to prove product market fit.
If you're not embarrassed by the first version of your product, your shipped too late.
https://robots.thoughtbot.com/how-to-define-and-prioritize-features-for-your-mvp