This was a short chapter about resource management and custom operators in RxKotlin. You learned how you can (or should) create, use, and dispose resources. You learned to create custom operators. You also learned how to compose multiple operators to create your desired one.

This was the last chapter on the fundamentals of RxKotlin. From the next chapter onward, we will start applying our gained knowledge to real-life scenarios and projects.

In today's app-driven era, writing APIs is a primary requirement; in the next chapter, you will start learning Spring in Kotlin so that you can develop your own API for your projects.