How to increase 2 stitches in 1 stitch with yarn over - back and forth

In this DROPS video we show how we increase with 2 stitches by knitting 2 stitches in the same stich + 1 yarn over. We show it 3 times in the video, both how to do in from the right side and from the wrong side.

Knit 1, but wait with slipping the stitch off the left needle, 1 yarn over right needle, knit 1 in same stitch, then slip the stitch from the left needle. On next row purl yarn over twisted to avoid holes (= 2 stitches increase).

We use the yarn DROPS Snow in the video.