Sewing Machine Tips for Presser Feet: Adjusting the tension knob according to your fabric. Heavy fabric: less tension. Lighter fabrics: More tension. Then the presser foot will hold the fabric securely to the feed dogs & keep it from sliding.
15 Bad Sewing Habits You Need To Quit Doing (I did not know the proper way to unthread a machine until today - clip thread at spool and pull out from needle area. Removing spool while thread is attached can mess up tension!