How to gain mana?

Could you please elaborate on the methods to acquire mana? I'm quite interested in understanding the various avenues available for accumulating this elusive resource. Is it primarily through gaming achievements, or are there other means such as trading or completing certain tasks? Could you provide a detailed breakdown of the steps involved in gaining mana, as well as any tips or strategies that might help me in my endeavor? I'm eager to learn more about this fascinating aspect of the game world.