This type of knot is the Macrame knot. Take the rightmost string and make an L-shape. Then take your leftmost string and place it over the L.
Then just tighten the knot to bring it to the top.
Then do the same steps on the other side!
When you're done it will look like this.
You can also do a fishtail braid or a regular braid if you want your bracelet to be nice and simple :)
Again, I promise I will post photos of the craft project that we had for Muni Market Day. :) Stay tuned!