what is composition and DOF?

Hi, what is composition and DOF?
How can i actually do to hone my photography skill?
I always have a passion in photography but dunno how to improve myself.
Would really appreciate if someone could give me some advices.
THANKS!

composition ＝ 构图

DOF ＝ 景深 说白了就是背景有多模糊

Thanks for the reply, really. ::xt030::  I heard someone told me that we can practice on our composition by using black and white photos. Why?

原帖由 williamlau 于 2009-4-23 13:30 发表
Thanks for the reply, really. ::xt030::  I heard someone told me that we can practice on our composition by using black and white photos. Why?

因为黑白更多强调的是光影变化及构图。色彩什么的就不用考虑了。