Objective: Practice controlled stitching on scrap fabric by sewing straight seams, turning square corners, and locking stitches with a backstitch, building the muscle memory you'll need for real projects.
Before sewing anything you'll sell, you need consistent, repeatable control. Three fundamentals cover most beginner sewing. First, straight seams: the metal throat plate on the MC6650 has engraved guide lines (commonly at 1/4", 3/8", 5/8", etc.). Instead of watching the needle, keep the raw edge of your fabric riding along one of these lines. This keeps your seam allowance even without guesswork. Set a basic straight stitch (stitch #1 on the direct selection) at length 2.5mm, the standard for construction seams. Second, locking stitches: a seam that isn't secured will unravel. Use the reverse button (or the lock-stitch button) to sew 3-4 stitches backward at the start and end of each seam. On the MC6650 the automatic thread cutter then trims your threads cleanly. Third, pivoting corners: to turn without losing your line, stop with the needle fully down in the fabric (press the needle up/down button so it ends in the down position), lift the presser foot, rotate the fabric 90 degrees so the next edge lines up with your guide, lower the foot, and continue. The needle acts as a pivot anchor so the corner stays sharp. Go slowly—use the speed slider set low—because control matters more than speed at this stage.
Example: Take a 6-inch square of scrap cotton. Set stitch #1, length 2.5, speed slider to low. Line the right edge against the 5/8" guide. Press reverse and sew 4 stitches back, release and sew forward down the edge. About 1/2" before the bottom edge, press the needle-down button so the needle stops in the fabric, lift the foot, rotate the square 90 degrees, lower the foot, and continue along the next side. Repeat at each corner until you've framed the square, then backstitch 4 stitches and let the auto-cutter trim. You should have an even 5/8" box with four crisp corners.
Try it: Cut three 6-inch squares of scrap fabric. On the first, sew straight lines keeping the edge on the 1/4" guide. On the second, do the same on the 5/8" guide. On the third, sew a complete square frame with a needle-down pivot at all four corners and a backstitch at start and finish. Compare the three—check that your seam allowance stays even and the corners are square, not rounded.