A User Guide is available to help acquaint users with features of Illuminated Cloud and the host JetBrains IDEs, and many detailed feature-specific demonstration videos have been posted to the YouTube channel.
The following demos and videos are available to help familiarize you with Illuminated Cloud:
The following videos and corresponding linked topics may also be useful. Note that the user interface has evolved since some of these videos were recorded, but they should be directionally useful.
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Using integrated API documentation
Ad hoc unit Apex test execution
Apex unit test run configurations
LWC Jest unit test execution
Offline Apex debugger
External log files
LWC Jest unit test debugger (commercial IDEs only)