I’m Ali from a²(w) and today I’m going to help you trouble-shoot a couple basic stitches. Nothing stinks more than trying to sew something and having your stitches look like the sewing machine barfed them out. Yes, this used to happen to me a lot until I figured out what was wrong.
On the left you can see that I set my length to 0.3. The stitches are almost on top of each other. This is called a satin stitch and is used in applique. Right below that line the stitch length is 0.5, so just slightly further apart. Moving to the right, you see a stitch length of 1. I increased my stitch length by 0.5 per row (I didn’t change the stitch width) up to that huge 5 on the right. When finishing the seams on clothing, I usually use a 2.5 stitch length instead of a serger.