This chapter has provided short introductions to a few topics not covered elsewhere in the book. We've seen the different forms of support for concurrent programming that D provides in the language, the runtime, and the standard library. We've had brief overviews of memory safety with SafeD, the garbage collector API, and binding D to C++. We've also taken a quick look at a handful of useful Phobos modules. In short, this chapter serves as a starting point for further exploration of the D programming language. Good luck!