New knitters sometimes have a hard time understanding where the yarn should be positioned after turning the work, particularly after completing a knit row. If you don’t do this correctly, you can end up accidentally adding a stitch. The following video shows where to hold the yarn after turning your work to be positioned correctly to begin knitting either knit or purl stitches. You might also want to check out these yarn and stitch orientation tips, one of which explains how to make sure you pick up your project and resume knitting the correct direction after stopping in the middle of a row.
Where to Hold the Yarn After Turning Your Work
Cushion of Joy 