...
NiFi's JIRA page can be used to find tickets that are tagged as "beginner", or you can dig into any of the tickets for creating Processors. Processors should be self-contained and not rely on other outside components (except for Controller Services), so they make for excellent starting points for new NiFi developers to get started. This exposes the developer to the NiFi API and is the most extensible part of the dataflow system. The NiFi Developer Guide provides details on how to get started with the NiFi API as well as best practices and common approaches to component design.
We have additionally created filters that show various types of issues available to be worked:
Documentation Contributions
...