The Durable Execution section of the Temporal Developer's guide covers advanced beginner concepts for working with Temporal, including testing your code, reviewing workflow event history, adding timers, and understanding determinism. Developing for durable execution is a core aspect of Temporal.
The Features section of the Temporal Developer's guide provides basic implementation guidance on how to use many of the development features available to Workflows and Activities in the Temporal Platform.
The project setup section of the Temporal Java SDK Developer's guide covers the minimum set of concepts and implementation details needed to build and run a Temporal Application in java—that is, all the relevant steps to start a Workflow Execution that executes an Activity.