should we delete the build directories created in LFS for installing binutils-2.20? [closed]

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I am in the part ( http://www.linuxfromscratch.org/lfs/view/6.6/chapter05/binutils-pass2.html) ( http://www.linuxfromscratch.org/lfs/view/6.6/chapter05/binutils-pass1.html)

they ask me to build binutils again? i dont understand should we delete the binutils-build directory we used in the begining and create a new one for this build??? and what is pass 1 and pass 2? i am confused :/

please help :)