Thanks Cavsfan, but from my experience I want to ask specific questions. I don't want to read all manual to Grub2 or another things, because you see, I do this mistake in Grub1, and now there is Grub2 and my knowledge is for nothing! I don't want to know all Linux configurations before I make simple change that its necessary for my system. I want to learn what is necessary to be learn! I do my migration form Debian in hope to make life simpler! And I expect that from this community.
We learn all our lives, but we don't learn the same things, so please consider this in future. Thanks!