hello forum

2 replies [Last post]
Joined: 2016/04/10

hello everybody, this is my first topic i just joined.
So i know a bit of javascript,php,sql, i've heard of some programms like lazy kali, john the ripper, and i was doing "war games" you call it? hacking/cracking challenges i found on few websites. Never hacked anything besides those challanges i accomplished to finish. So my question is how do you hack website, and change all the html, css code and put your own like signature or whatever you want? I guess you do that by simple writing your own html,css code. But how do i hack it, only thing i know is that GET method is vunerable in php. I was trying downloading .php files from websites, but can't seems to find any vunerability?
Any tips, advices, methods are welcome. thanks in advance