After the patient’s surgery, suturing is required, and tying the knot is the final step of the suturing procedure. The method of tying the knot can be changed depending on the surgery and the hand used by the operator. In the case of abdominal surgery, the space inside is relatively small, so most of the knots are tied with one hand. In the case of surgical sutures, where there is more space, the two-handed knotting method may be chosen. In addition, if the operator’s dominant hand is the left hand, the left-handed knotting method can be used; if the dominant hand is the right hand, the right-handed knotting method can be used. For patients whose surgery is too hidden to be tied with both hands, they can rely on instruments for knot tying, such as needle holders. After surgery, patients should take rest, get enough sleep, and avoid strenuous exercise to avoid rupture of the wound. They should also pay attention to their personal hygiene and keep the incision dry to avoid infection. The diet can be rich in nutrient-rich foods to help the wound heal.