/armor: Sets the player's base armor attribute to the value provided.
/attackdamage: Sets the player's base attack damage attribute to the value provided.
/attackspeed: Sets the player's base attack speed attribute to the value provided.
/health: Sets the player's base health attribute to the value provided.
/speed: Sets the player's base movement speed attribute to the value provided.
/fly: Toggles the ability to fly for the player by calling .setAllowFlight() on the player depending on if they can or not currently.
/god: Toggles invincibility for the player.
/destroyentity: Completely destroys all entities of a certain type in a world by calling .remove() on each entity of that type.
/knockback: Toggles knockback for the player by setting the player's base knockback resistance attribute to either 1.0 or 0.0 depending on the current amount.