I'm so exited! I figured out how to make a sweater completely in one piece!

You start with the right sleeve and knit that until the shoulder, then cast on stitches on each side of the sleeve to make the front and back sides. Then knit until the next sleeve

. Bind off the cast on stitches and knit the next sleeve. To finish sew up the sides. A neck hole can be added while knitting or cut later. You cn use any any stitch for this so the possibilities are endless. (to be sure you are doing it right, in the end it should look like it was knit sideways. Whereas it's usually knit in pieces up and down.)
-----------------------------------------------------------------------------------------------...now months later i buy a knitting pattern book and almost all of its patterns are knit in almost the same way.