I need who can tell me more about c++ for web
C++ isn't much of a "web" language. It's a systems language. The web browser only interprets HTML, CSS, and JavaScript code. C++ is a compiled language, which means you "translate" it into lower-level machine code. This machine code is platform-specific, and is not cross-compatible across other people's browsers. But you could theoretically write a C++ interpreter (or possibly find an already-written one somewhere) that can do the job for you.