There are a lot of different styles of knitting and most of them involve knitting through the “front” loop. Usually that’s the leading leg. Eastern European, however, has the “back” loop or leg leading, and that’s the loop you knit and purl through. I’m finding that it is especially common among knitters who started with crochet.
I then wrap the yarn clockwise, if you are looking down from above, around my right needle.
And pull the new loop under the left hand loop on to the right needle, removing the left loop from the left needle. New stitch made!
For the purl stitch, I come around behind the back leg, insert the needle from left to right, wrap yarn clockwise, pull it under, pull the left stitch off.