It is essential to wet the line before tying a braid knot. Braided line is slippery and can easily slip when tying a knot. Wetting the line before tying a knot reduces friction and allows the knot to tighten properly. It also helps to prevent damage to the line by reducing heat when tightening the knot. Always make sure to moisten the line before tying a knot, regardless of the type of knot you are using.