only me think the development is hard

I don’t think you are new to C++ based on your comments about working with C++ in UE4
Just a general comment: C++ (compile) errors tend to be more “complicated” then C#

Error codes can easily be looked up with google, The MSDN docs on errors will generally tell you whats wrong.
Although sometimes you need to look at StackOverflow sometimes as the source of the error is a little gotcha or easily missed.

HTH