One of the most important parts of any software ecosystem is the community support and library development. Kotlin as a platform is no exception. For developers looking to get involved in the open-source world, this is a great time to jump in. While simple libraries are fairly straightforward, there are many details involved in implementing significant libraries, like: Where to use expect/actual? How to wrap existing libraries? How do handle testing, CI, publishing, etc. There's a lot you need to know, and the platform is changing fast.