> **Possible Duplicate:**  
> [What should every programmer know about web development?](https://softwareengineering.stackexchange.com/questions/46716/what-should-every-programmer-know-about-web-development)  

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I'm 15 years old. I've been programming for 2 years. I suppose I am a good programmer (not designer).
I can use PHP(Good), Css(simple), and JQuery(not too bad).

What else can I learn related to web development (maybe system programming)?
Thanks for your suggestions..