Minecraft wiki entry for Dual_wielding, associated text: Before we begin the tutorial, it is important to recognize these two terms: main hand and off-hand. By default, the main hand is the player's right hand. Respectively, the player's off-hand is their left hand. Keep in mind that there is an option located in Skin Customization labeled "Main Hand" to swap the main hand and off-hand. This option may be helpful for players that are left-handed.