How to keep edges from rolling

Hi! I’m new to this forum and to knitting. I am a left-handed knitter and although I have gotten the knit/purl stitches down, I still get edges that roll under. What am I doing wrong? I tried to make a scarf - it looks awful at about half it’s size because of the rolling. Any/all advice is welcomed. Thanks a bunch, Anita

Stockinette stitch (knit a row, purl a row) will always roll. Its just the nature of the stitch. To combat this you might want to add a decorative border.

There is an extensive thread in the “How To” section all about this topic.