Skipped stitches can be very frustrating. You need to make sure your needle is new and is the correct type and size for your thread and project. Re-threading the machine both top and bobbin is many times the answer. Cleaning and oiling are mandatory. But after all this is said and done many times you are still having an issue.
I have made this video to show you how important the height of the foot in relation to the surface of the fabric can be. If there is too much room between the bottom of the foot and the fabric, you can get flagging which will cause skipped stitches. Flagging is where the fabric has room to move up and down with the needle.
I hope you enjoy the demonstration and it helps you to solve a skipped stitch mystery someday.
Here is a video that I found from last January that shows using fusible for a backing to your quilt label so that it is perfectly turned and easily applied ready to hand stitch in place. Since I just showed you how to create this type of quilt label with lettering, I was very happy to find that I had made a video showing the actual process of turning it for application to the quilt back.
Here is a post from my facebook page that will really help when you get thread in and out of the tension or thread that is shredding and breaking at the needle. This is shown on a serger but the premise is the same on a sewing machine. You do not even have to un-thread the machine sometimes, just turn the spool over and continue. Other times it may work best to turn the spool and re-thread. Be sure to use a thread net when needed.
This a a great video from BERNINA about needles. Figuring out which needle and thread to use for your current fabric will save so much frustration and make your stitching smooth and beautiful. It is important to test a few samples before starting to get it right. Keep many types and sizes of needles on hand so that you can find the correct one. Needles are the least expensive tool in your sewing room and one of the most important.