Best takeaways from the article (no particular order):

  - Retool ads as a way to test for and identify demand.
  - Bait people with truly useful content where they're already looking, and then direct them to your app.
  - Simple changes in wording or flow of UX can increase shares dramatically.
  - Get featured in app stores. How?
    - Integrate with latest device features being pushed
    - Adhere to vendor design standards
  - Email is still very effective, so use it.
  - Have 10 enthusiastic users that will spread their enthusiasm before you start.

That last point is good to know, and perhaps the most important, but it's way easier said than done. Especially if you aren't a social butterfly.

Also, the "don't use cross platform" preached in the article isn't very convincing. You can get excellent performance with well-coded cross-platform build tools, and in far less time.