Why are the edges of my knitting messy?
One reason for loose edge stitches can be that the needle tips are repeatedly pulled too far apart, stretching the yarn between the neighboring stitches. The yarn slack accumulates at the last stitch of the row. Keep your tips close together while knitting.
How do you knit cleanly?
To knit a nice, smooth fabric, you need to keep your yarn at the same tension as you create each stitch. You can do this by tensioning the yarn between your fingers and easing out yarn as you need it. Again, there is no “right” way to tension your yarn. It will become a matter of personal preference and comfort.