How can I tie a tie without causing it to become wrinkled or creating a visible slur in the knot?

To tie a tie without causing wrinkles or a visible slur in the knot, make sure the tie is smooth and flat before starting. Use gentle, even pressure when tightening the knot, and adjust the length carefully to avoid creases. Practice tying the knot neatly and symmetrically to achieve a polished look.