How can I make a website more secure so that it becomes more secure and avoid from any misuse? How can I protect website from hackers? Also need to know the main areas (loop holes) from where usually a website can be used illegally/crime way.
Related posts:
Keep your site creation software up to date.
Make sure to bulletproof password protect the SQL database on your server.
Study up on SQL injection methods:
(good source is GRC: http://www.grc.com/search.htm?cx=000064552291181981813%3Ay8yi5go2xza&cof=FORID%3A11&q=sql&sa.x=37&sa.y=11&sa=Search#1113
Keep current with exploits & trends: “Last Watchdog” is an excellent source;
http://lastwatchdog.com/category/for-technologists/
Use all available ‘sanitizing’ technologies.