Learn PHP programming from books, forums, parse examples, etc.
Let's say the situation is I wrote a few pages.
Title forms, registration and sign in to your profile and are now looking for a site which "came" to my website and subjected to attack by known methods: injection, java stript-s and more.
After the attack I was given the list of holes that have to cover.
I at least have the silly bugs to see and understand.
I would be very grateful for hints.