Cords (size of your choice) Linhasita threads, waxed threads...
 connectors, natural beads...
 a lighter, a thread burner

To start, cut a thread of about 50cm to be comfortable. Once the technique is mastered, you can adjust the size more precisely.

Make a simple knot at the center of the cord, then thread the bead. Make a second knot on the other side of the bead to secure it. To make the knot close to the edge of the bead, use a needle passed through the knot, it will allow you to slide the knot as close to the bead as possible. Tighten and then remove the needle.

The knot:

Place the cords in the shape of the bracelet, the 2 ends cross. If you wish, you can insert a bead on the 2 cords to help with the crossing.

Try on the bracelet to determine the size and approximate placement of the knots. 

Follow the diagram above to guide you.

Pass the left cord under the right cord, then bring the left cord back to form a loop. Hold it with your right hand.

Then wrap the cord around the 2 cords for 2/3 turns. You can tighten the turns, no need to keep them loose.

Finally, pass the cord underneath to enter the starting loop.

Tighten the knot gently. Then cut the cord to 2mm from the knot and burn the end, being careful not to touch the knot. The end will melt, press with your finger to stick the tip to the knot. This will prevent the knot from coming undone. If you wish, you can also place a small dot of glue on the knot.

When you tighten the knot it will move, the difficulty is to do it in the right place. To do this, plan to start it in front of the predefined area, because when tightening the knot it will move further away. Practice on a test cord before making your bracelet.

For the second knot, proceed in the same way with the other cord. 

And there you go! Beautiful creation!