how to save my site from hacking ?

hi there m really disappointed when i saw my site showing a message. hacker change my index page and he use his own page in my site . dont know how he do that i use strong password . how he change my site page ? i think he use RTE OR DNN system for hack my site . now i need strong security to prevent hacker from my site . but i dont know how to make secure my site.
if u have any tutorial or something to prevent from hacking please share with me .

thank you in advance

Are you using WordPress?

Some questions have to be answered before any help can really be given:

Do you have ANY saved FTP password in total commander of FAR manager?

blueraykhazana said:

Are you using WordPress?

Click to expand...

I use WordPress and I've had a couple of my sites "hacked". Pretty easy to fix. But it is aggravating.