Help

Can someone explain to me how the level system works in Final Fantasy 2.
Final Fantasy 1 was simple and I beat it in 5 days and defeating the new monsters they add. If anyone knows just tell me

Ok look at these

To level up Strength: Attack during battle
To level up Stamina: Lose HP during battle
To level up Spirit: Cast White magic
To level up Intelligence: Cast Black Magic
To level up Magic: Lose MP during Battle
To level up Accuracy: Attack with a weapon
To level up Evasion and Agility: Be the target of Physical Attacks
To level up Magic Defense: Be the target of spells and special attacks
To level up Magic Spells: Use the spell in battle
To level up HP: Reduce HP by half in a battle.
To level up MP: Reduce MP by half in a battle.

There is no level system in the game. In order to raise stuff you have to do the stuff above. Also an easy way to raise HP is for one of your party members to attack you. I got over 1000 HP at the very start of the game by doing that.