Hi Agnes! You should decrease on both sides -the right (knit) side and the wrong (purl) side. You p2tog on the wrong side (as you did) and you SSK on the right side. SSK (slip, slip, knit) is a left-leaning decrease. You slip two stitches (on by one KNITWISE) on the right needle and return them onto your left needle (now their right legs or at the back of the needle), and you knit them together – insert the needle through the front into both loops and knit them together. Hope this helps!

One side of the sock, the purl side where I knit 2 together is fine, but then the right side I do not decrease, I only slip those stitches and turn, am I right? No decrease on this line? I did this and I get two different sides to my sock. One side looks like a proper decrease, the other side looks totally different and the whole sock looks out of shape. Am I understanding this rightly? Do I only decrease on the purl side? I would love your advice. Thank you. Agnes

Thank you so much!
When you pick up the stitches you also knit them – you insert the needle into the first stitch from the heel flap, grab the yarn and pull it through. This way you have and additional stitch on the needle and the yarn is connected to that last (11th) stitch on the needle. The images in the “Heel Gusset” section show this process step by step.
Hope this helps!

Hi, if you mean sock pattern, then they are all worked in the round – you could try to watch a tutorial on YouTube on how to knit with 5 needles or could also look up how to use the magic loop method – you use a circular needle instead of DPNs. If you want a simple project to practice knitting, you can check out my headband patterns, that are worked flat with two needles. For example this on uses a simple textured stitch:
https://mirellamoments.com/the-yarrow-headband-knitting-pattern/

You’re welcome I’m glad the tutorial was useful!

That’s a great question! I actually do it both ways – sometimes I decrease in every round, sometimes in every other (=with that plain round in between the decreases). Lately, I’ve been decreasing in every other round. In theory, if a person has low arches or it’s a small size, it’s better to decrease in every round, so the sock fits better, but with a standard sock (that is knit in stockinette with fingering-weight yarn), I don’t really see the difference. For larger sizes, it’s always better to decrease in every other round, so the decrease part is a little longer.
For the basic sock pattern, I chose to do the decreases in every round, because it is a little simpler.