The Hitpoints skill determines the maximum amount of Hitpoints you can have. Your maximum Hitpoints are determined by your level multiplied by 10. Hitpoints experience can be earned by dealing damage to Monsters. 0.133 XP is awarded per point of damage done to a monster. This experience can be increased by 10% by equipping the Gold Emerald Ring.
Hitpoints are passively regenerated at a base rate of 10 per minute. This rate can be increased by equipping a Gold Ruby Ring, which changes the rate to 10-30 per minute or the Hitpoints Skillcape which increases the rate by 50 per minute. This rate can be doubled by using the Rapid Heal Prayer. Hitpoints may also be regenerated by eating Food.