C++ is a wonderful language that I enjoy using daily. [...] C++ has more power than any of us can handle all at once. I doubt that there are more than half a dozen people on the planet (and I have specific names in mind here) who are true experts in the entirety of C++, from the core language to all the facets (pun intended) of the standard library. Most of the rest of us can only aspire to know a few narrow areas in depth and the whole reasonably well.
Fortunately, there's no need for us to all be Stroustrups or Koenigs to get concrete benefits from C++. Just avoid the dusty corners of the language, and remember that cuteness hurts in many ways. Above all, "write what you know, and know what you write," and you'll certainly do well!

Herb Sutter, Advice From the C++ Experts: Write What You Know, and Know What You Write