The custom of kneeling on one knee originated in Europe. Westerners like to use duels to solve problems and show fairness. The same goes for love. After winning, the winner touches the tip of the sword with their right hand and kneels down on one leg with their right knee, expressing ownership to the girl. In court etiquette, knights kneel down to the princess and swear allegiance. So when a boy kneels down to propose to a girl, it means swearing to love you forever.
The method of kneeling on one knee
Stand naturally with your feet shoulder width apart, hands hanging on both sides of your body, take a step forward with your left leg, step forward with your left foot in a bent knee position, kneel on your right leg, and lower your hips. Your left leg should be at a 90 degree angle to your lower leg. Westerners are accustomed to placing their left hand on their chest when proposing to show their devotion.