What's the story in terms of using existing C (or C++) code with BetterC or D in general?
I'd pick up a comprehensive book like Ali Cehreli's "Programming in D",
https://www.amazon.com/Programming-Tutorial-Reference-Ali-Ce...
and come hang out in the D forums:
https://forum.dlang.org/
You can mix and match C and D code easily in the same program, and to a lesser extent C++ code. This means a larger project can be incrementally converted to D while keeping it running and shipping.
I'd pick up a comprehensive book like Ali Cehreli's "Programming in D",
https://www.amazon.com/Programming-Tutorial-Reference-Ali-Ce...
and come hang out in the D forums:
https://forum.dlang.org/