If there are things you still do not understand, tell it there, so that I can put answers directly in the wiki (easier to access for everybody).
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]]>Some more simple points :
- ABS is completely optional. You can run Arch w/o ABS.
- ABS is what the arch developers use to create and maintain the distribution.
- ABS is for you if you want to change how some packages are compiled.
- ABS is for you if you want to add software "the Arch way", i.e. put it under pacman's control instead of the "./configure && make install" routine which would put "stray files" into /usr/local