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One of the first things I did, as a kid learning to sew, is figure out how the lock stitch worked on a sewing machine. You had a bobbin of thread in the bottom and the machine wrapped the top thread around it without getting tangled up (for the most part.)

This image is the best explanation I have found for the process. Very cool to see how it works. The bobbin is feeding out the blue thread and the main green thread comes from the top. Compare this image to your sewing machine and you will be able to identify the portion around the bobbin that fills the role of the red section in that animation.

Here is the most ambitious thing I’ve made with a sewing machine.