In <ROM>, various skills are prepared for each class.
You can learn basic skills by visiting the 'Skill Book Shop' NPC in each region, paying the required cost, and purchasing 'Common' or 'Class-specific' skills. After purchasing, you can double-click the skill book in your bag to learn the corresponding skill.

Additionally, skills can also be obtained through monster hunting and purchased from Auctions, so please keep that in mind.

If you already have a skill and obtain the same skill book again, you can still enhance it based on probability.