Why is it possible to set a left margin, but not a right one? Why should this command/code be so difficult? I want to center my text on my site, and it is difficult to do (at least to me).

I am a neophyte, and have only been working with HTML/CSS for about a year. I find it amazing that the powers to be can make the process so difficult. There seems to be an effort to keep changing things so that the
newcomer has to constantly change his way of thinking.

I know the ole saying that "the only thing constant is change" but I often wonder if the folks who manage all this just want to keep their elite status.
Okay, now shoot me down.