Beginner: TRY and CATCH fonctions nothing catches

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... do I have to create an error for the code to catch it, and if nothing catches how do I know that the Try Catch functions worked?

Yes you would need an error to see those code-lines beeing done, that's what you told the code to do, Try this code (in your example NO Code), if it works that's fine, if it raises an error Iit will be "catched".