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you are not going to get much out of LQ if you post like this. one question = one thread, and chekc you have done your research before asking and are providing the most information on each issue as possible. What do you want to do with grub?? You can edit it in any text editor... that's surely not the answer you're after though. And a useful thread title would also put you in a much better position too.
These questions should a little bit academic in nature so I am kinda gunna hold off on answering them. As for the grub conf, I'd suggest looking it up on a search engine, since that is an area that could if it goes wrong lock you out of your system and you don't sound like you even really know how to edit it safely yet, so it's worth looking at full guides rather then a quick summary answer. Most of these apart from number 4 as two second finds on google...
Linux Questions has a very nice Search menu.I suggest that you start there,because your questions have already been answered.Also,don't you think that posting a single question or description of the single problem as a thread title would be better for you,those who may want to help you and for those who will be searching for a solution of a single problem in a single thread?
edit: I see that,in some way,my point has been made already.
1-Can you please describe in few words the linux boot process, and ending process?
It boots. That was two words, which I guess was a few. It also differs among distributions, which is a few more.
1.1 What are the crucial services /Daemons that is loaded during boot-up and ending?
Look at the services that you are running. You are running them.
2-I wnat to edit my grub.conf but, i have no clue how, and iam very much scared of messing up my system?
Well, don't then. Or do, have a live cd nearby and have a backup copy that you can use.
3-I also have a problem in how to install a software in my CentOs machine
i get confused with rpm and tar.gz packages, please tell me what the exact steps in compiling , executing , etc?
Well, use the package manager. It is there to manage packages. For available packages, it makes things trivial. For packages that currently aren't available, if possible, add repositories to make them available.
4-I want to know how to perfom a back-up locally, and onto a remoter server! what are the third party softwares if any i can use to do my back-ups.
For a single machine with a reasonably sized "/home" you could just burn a DVD using, eg, k3b. You may also want to back up text files that you have altered in /etc. For a network, you'd want something better.
5- Last but not least, how to create a repository ? and how to effectively use yum to install it.