The largest nappy fold is the triangle.
Basically just as it sounds, you fold the nappy into a triangle, corner to corner.
You need to boost this nappy, either with another nappy folded into the middle, or with other boosters. I prefer bamboo for it’s absorbancy.
Simply place baby on the nappy and fold the corners in to meet, I usually start with one layer between the legs, then the sides, then the other layer between the legs and secure with a snappi.
The nappy on the baby will look like this.