Instruments is a big topic, and we covered much of it. We started with a tour of the trace document window, and moved on to populating it from the Library window. We covered general principles of how to configure an instrument track.
We saw the various ways to start and stop recordings, including human-interface recordings that can be played back to generate repeatable tests for your applications.
We took inventory of the instruments and document templates Apple supplies, and how to create your own.
As your needs and expertise progress, you'll want to consult the Instruments User Guide, which you can find in the Xcode Documentation browser.