Where is the end user documentation for Unity?

Is there any end user documentation for the Unity launcher?

Failing that, is there at least something as tips&tricks or reference materials (for example, a list of available keyboard shortcuts, etc.)?

Failing that, is there any specification and/or developer documentation from which one could derive some useful information?

I'd especially like to have some reference about the way search works.

Solution 1:

Click on the Ubuntu button and look for help by typing "Help" in the dash and click on the Help icon:

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This will pull up the documentation:

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You can find the web version of the documentation here:

We're also collecting tips and tricks here:

Nowhere. There are currently a bug open about it, it doesn't get a lot of updates, but looks like at least some people are working on it.