I can't believe it, but I can answer this!
yfwd and yo are basically the same... however! One makes a bigger hole and one makes a smaller hole!
yo would mean that you bring the yarn over the needle to the front than back under the needle to the back before you insert the needle to make the next stitch.
yfwd would mean that you bring the yarn UNDER the needle to the front than over the needle to the back before you insert the needle. Essentially you don't have to do that over the needle bit before you insert the needle into the next stitch, because you will naturally have to pull the yarn back in order to make the next stitch.
This will make a smaller hole than a yo.
It's true! I know because I made my mother a huge poncho and did yfwd's instead of yo's and I was so disappointed with how it was looking. Then right up by the neckline, countless hours of knitting later, I :doh: and tried it the other way! All of the sudden it looked right. Only I had to frog the right bit, because I wasn't frogging the wrong bits at that point.
Initially, the poncho was for me, but with my wrong yfwd I changed the size of the project so much it no longer fit me (6 ft tall me) but my mother (5 ft 3 inches tall).
:cheering: :cheering: :happydance: :happydance: [I got to pretend to be an expert]