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Sewing is the queen of lost skills, so if you don't know even the most basic stitches, you really aren't alone. At minimum, though, you should know how to sew hems, repair small rips and tears, and attach buttons.  Learn a variety of basic stitches, including the straight stitch, the back stitch, the zigzag stitch, and the basting stitch. Invest in a sewing machine. As your sewing skills improve, consider buying a sewing machine of your own. You will probably be glad that you did. Fixing garments and creating projects from scratch will both be much easier if you learn to machine sew as well as hand sew. Sewing is not the only lost skill worth learning, of course. There is a wide range of other crafts and domestic abilities you can explore. You do not need to master all of them, but picking one or two you'd like to become great at can improve your standing as a domestic goddess.  Potential areas of interest could include gardening, crocheting, or knitting. You could also check out community craft websites, like Pinterest, to get more ideas. You can learn a lot by teaching yourself, but sometimes, the best way to learn a new skill or to advance an old one is to take an actual class on it. Look for cheap classes in your area or sign up for a class online.
Master the basics of sewing. Get crafty. Take classes.