Necessary knowledge to be a WEB DEVELOPER

[eluser]Beginers[/eluser]
Hi All i am planning to become web developer soon as i graduate.

I have many questions that came up in my mind that needs to be answer by anyone.

What are the important things or skills i need to know to be a better WEB DEVELOPER?

I know only basic HTML, CSS, Javascript and PHP.

How do i make my website very secure from any hacking activities? like

SQL Injections
Session Hijacking
Network Eavesdropping
Cross Site Scripting
Brute Force Attacks


what are some good practice to be a web developer?
What are the common codes used in making website?


Please help.

Regards,
Beginers
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DREAM HIGH!!!