I knew a dude named Farhad a long time ago. You wouldn't be using your name as your screen name are you? Also, nobody said we weren't offering basic info. There are some things people need to learn by doing as opposed to reading. Welcome to this thread anyhow farhad and if you stick around, I'm sure you'll learn a thing or two about vertical growing.
Any honest person will tell you that they learn something new daily and that they don't know half of what others may think they know or what they would like to know. I for one, learn new things every day and even though I feel I have a solid handle on growing, still have much to learn.