How to protect website from hackers?

Question by Sup B: How to protect website from hackers?
my friend is opening up a website involve in selling merchandise. he heard that people who know mysql and php can hack into websites. How do they hack into websites by injecting scripts or what and how does he prevent hackers from stealing customer’s credit card numbers etc and personal information?
How do hackers inject mysql into my friends website and how do i prevent it from stealing information and data
i mean SQL or something and i heard there was something called a packet sniffer what is it?
He wants to know where the hackers attack from the web host or what and how they inject SQL or something like that

Best answer:

Answer by quatre707
If he is even asking that question, he needs to be paying a professional to host his Web site.

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