Lfs & Blfs
 

what is the diff between them

LFS gives you a bare-bones system that will boot and compile stuff. That's all. No web surfing, no KDE, not even mail! BLFS (Beyond LFS) gives you what you need to make a Linux system that actually does something.

thanks alot
 

so does it mean that i haveo to download both packages

or that blfs contains what lfs have and more

blfs does not contain the lfs-packages. Just build first LFS, and then, if you want a productive system, go on with blfs.

BLFS is just a term for all that you can do with your system after you finish LFS (hence the name beyond LFS). There's an BLFS Book (similar to the LFS book) which discusses common things people do, such as setting up more networking, XFree86, email, firewalls and so forth, but BLFS isn't limited to what the book contains. The BLFS book just has a very few things compared to what people do with their systems.

You may only pick a few things from the blfs books and lfs-hints. Then you'd go on installing something not covered by the book. That's still in the BLFS realm even though the book ends somewhere.