What does "Only catch exceptions you can handle" really mean?

I'm tasked with writing an Exception Handling Strategy and Guidelines document for a .NET/C# project I'm working on. I'm having a tough go at it. There's plenty of information available for how/when to throw, catch, wrap exceptions, but I'm looking for describing what sorts of things should go on inside the catch block short of wrapping and throwing the exception.

try
{
   DoSomethingNotNice();
}
catch (ExceptionICanHandle ex)
{
   //Looking for examples of what people are doing in catch blocks
   //other than throw or wrapping the exception, and throwing.
}

Thanks in advance