OK, a yoked sweater has one circular panel around the shoulders--so obvious increase lines. Very often you'll see sweaters with a pattern around the yoke and plain the rest of the way down.
A raglan sweater has the increases going diagonal from the neck to the armhole, usually made in a way that's a bit decorative, but always noticeable.
A hemmed sweater is just a different style. You can add ribbing if you prefer it to the hem.
The 3 stitches to increase around is a line that runs from the armpit to the cuff. The increases are worked on either side of that. The center of the 3 would be the center underarm stitch of the sleeve.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry