What are the hardest specific parts of C++/C#/Java which show's you're an expert? [closed]

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Just wondered what are the features of the three main programming languages which show you are an 'expert'? Im using this as a benchmark to improve my employability.

Am i right in saying for C++ the most difficult aspect to master is (smart) pointers?

Java seems much easier as memory is handled for you. I'm not entirely sure on C# either?