This tutorial is only half complete.
There is no mention of burning dual-layer DVD's. 99% of all movie DVD's are on dual layer disc's which hold about 8 gig. If you burn to a single layer DVD blank it can only hold 4 gig. Very rarely will you fit a movie and all of its menu's and extra's onto a single layer disc without sacrificing something. Even if you strip off all the extra's and just copy the movie it still usually won't fit. What the copying program does is it "compresses" the movie. What that means is the program takes bits of video and sound out of the movie its thinks you won't miss to fit onto the single layer disc. So in reality its not a perfect copy. A little compression you won't notice..but the more you compress the more you'll notice. I burn my DVD's to dual-layer discs if they are to big for single layer. I have an NEC dual layer burner (about $50). The caveat is the dual-layer blanks are more expensive than single layer (about $1.50-$2.00 per blank). I use DVDdecrypter to burn dual-layer discs. Verbatim make the best DVD blanks.
This site has much info on burning DVD's:
http://club.cdfreaks.com/