I can read C++ pretty well, I know how to build, compile, and run C++, but I probably couldn't write very good C++. I think it's like reading a book about how a

I can read C++ pretty well, I know how to build, compile, and run C++, but I probably couldn't write very good C++. I think it's like reading a book about how a machine gun is used in action and constructing one vs. given a machine gun with no hands-on training and trying to use it myself.