It's really not. In fact, it is super dooper easy, no more difficult than knitting in fact!
The best way to illustrate this is with a couple of photos.
This first photo is just to give you a visual of a normal knit stitch. Notice how your needle is going through the front of the stitch.
When you knit through the back of the loop it twists the stitch by bringing the left leg forward. This is what closes up the hole left by the yarn over.
This is a really useful technique to know. If you come across a stitch on your needle which has somehow got twisted and has its left leg forward you can knit it through the back of the loop and untwist it. There's no need for jigging it back and forward between needles to get it to sit right before knitting.
So how do you identify a twisted stitch?
A twisted stitch will have the right leg behind the needle. It will also twist as you try to knit it. A normal knit stitch will be open to you knitting it, but a twisted stitch will cross its legs as if to say no.
Go with that intuition, it's all good!
Today's yarn: White Gum Wool in Gum Grey.
Knit on Addi Turbo needles.