What are (were) the most difficult parts of D?

[max haughton]

On Wednesday, 11 May 2022 at 05:41:35 UTC, Ali Çehreli wrote:
> What are you stuck at? What was the most difficult features to 
> understand? etc.
>
> To make it more meaningful, what is your experience with other 
> languages?
>
> Ali

Learning D is almost a complete blur in my memory but I 
distinctly remember not really understanding is expressions well 
into even fiddling around with them inside the compiler.