Where can I find a lot of good exercises on the wave equation?

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I find myself in the situation of needing to understand the wave equation inside and out -- I've studied it, obviously, and have been looking for resources for some time. So far in my search I'm surprised to learn that there does not seem to be a single good source for building up intuition and familiarity with this very important equation. Am I just looking in the wrong places? What resources would you suggest?