We are only 16 days away from WWDC 2019, and Marzipan is expected to be announced. Brent Simmons writes if you use Marzipan you are a Mac developer and he has a piece of great advice:
You’re a Mac developer now! For real. As a Mac developer, you should do what other Mac developers do: understand and respect the platform and get help from Mac users, power users, and fellow Mac developers.
Brent Simmons also linked to Craig Hockenberry’s What to Expect From Marzipan, with more details about developing for the Mac.
If you’re new to Mac development and want to some ideas before Marzipan arrives, read these articles.