This is the basics of making a loom out of cardboard and weaving on it!
You will need scissors, a cardboard square or rectangle, yarn, scissors, masking tape, and a plastic needle.
I would suggest holding your cardboard differently then they do, and cutting the notches on the short side instead of the longer side like in the next video (see me if you need this explained :)
These are some more advanced techniques to make your weaving more exciting!