Fuck you. I just gave you a website that will explain in-depth anything you need to know about designing an effective 5x5 program and you have the balls to ask me why I didn't take several hours out of my day to explain its content to you? Do some damn reading for yourself.
If I wanted to devote hours per day teaching about periodization, exercise selection, technique, nutrition, and iron game history, I'd be a coach and write articles for websites. I don't have the time to teach ungrateful pricks the basics of lifting and periodization. It would literally take hours for me to tell you what you'll find on that site. Do it yourself.