difference between slackware and lfs
 

Could anyone please tell me the difference between slackware and lfs, because in slackware you just install the selected packages that you want and that is still customizing while lfs you have to build the packages on existing disto and building packages consume a lot time.

That's exactly it. Slackware and any other distro come with the packages, you select, then it installs and compiles them for you.
Then like any distro, you customize how you see fit.

LFS is where you build everything up from scratch, you compile the base packages that are needed, then add whatever you want after that to make it a working machine.

If that's the case then why should I bother to build lfs while I could have slackware that comes with packages that compiles by itself and without worrying for time consumed and all the hassles that it brought.
To make me convince to build lfs enumerate it's advantage over other distro aside from costumization for I already know that.

Well, LFS will help you learn your system better, teach you ALOT about compiling software, keep your system lean and mean, build to optimization for your hardware from the beginning, teach you what Linux does behind the scenes, get a little deeper into what you do and don't need. And millions of other things.

If you are comfy with Linux, and can do 'anything' with it, but are wanting to know how you do it, then LFS might be one way to help you. There are lots of other reasons, it's just like picking a distro, it's personal choice.

If you don't want to run anything but the very most basic programs just to get linux booting, well then you can build LFS and stop after the first book. Then you will have just a booting OS with pretty much nothing but building blocks. Then from there, you choose what you want to do next. Well sort of anyway. Why don't you head over the Linuxfromscratch website and read the first book and decide for yourself if you want to do it. Slack is a very good distro at teaching you how linux works, and things of that sort, if you want to get deeper, well then LFS might be what you're lookin for.

Thank's for the explanation as of now I'm 75% convince already.

I just downloaded and am installing Slackware for the first time. All I have ever done up till now was Red Hat 7.0-7.3, SuSE any tips.

Don't get discouraged, configure your network first so you can browse LQ when you run into problems.

Read as much as you can, visit this site for answers, ask if you can't find them. You either love Slack or will hate it.. If you like to configure things by hand or get down and dirty to see how everything works, you should love Slack. If you like the GUI tools, just click and go, then stick with the others, even though you can edit by hand with those as well.

I loaded RH7.3 for my roomate, took a look at the startup scripts and I got confused.. and my eyes went crosseyed. I like Slackware even on that aspect, simple scripts, easy to read and edit.

Sorry, didn't mean to get off topic. Though the advantage I see doing an LFS install is that you get to install what you want and only need, no unecessary packages. Its your distro. You don't have to mess with all the packages that distros install and you get to learn how the OS works in the process. You really learn the in's and outs of Linux doing an LFS install.