Sometimes patterns, especially older patterns, will tell you to decrease without specifying which decrease to use. Or you may be working a pattern where you think a different decrease will work better than the one the pattern calls for. In this video, I compare three popular decreases side-by-side so you can see the differences.
Slow demonstrations of the three decreases:
Knit Two Together (k2tog): https://youtu.be/10Ko-GJ8Vbk
Slip, Slip, Knit (SSK): https://youtu.be/Cg1ykku04is
Pass Slipped Stitch Over (PSSO): https://youtu.be/QTYc54b_RBo
The bulky yarn I used for demonstration is Knit Picks Wool of the Andes Bulky in Yonder.
The needles I’m using are Knitter’s Pride Nova Platinas, from an interchangeable set:
http://astore.amazon.com/verypinkcom-20/detail/B00O99S9UQ
The ball-chain stitch markers I’m using can be found here:
https://www.etsy.com/shop/DarnItSewWhat?ref=shopsection_shophome_leftnav
The nail polish I’m wearing is by Julep, color "Amanda".
http://refer.julep.com/s/stacip
My silver ring is actually a knitting needle gauge, and can be found here:
http://malojos.com/