MapleStory/Professions

There are two harvesting professions: Herbalism and Mining.
There are three crafting professions: Alchemy, Smithing, and Accessory Crafting.
Learning Herbalism is a requirement before you can learn Alchemy.
Learning Mining is a requirement before you can learn Smithing or Accessory Crafting.
After learning a profession, you can unlearn it through that profession's master. Your level of mastery in that profession will return to zero if you choose to unlearn it.
Herbalism allows you to gather seeds and flowers which are located in Saffron’s Secret Herb Patch in Ardentmill and some hunting maps. It also allows you to use those to create items needed for Alchemy.
Mining allows you to gather ores which are located in Cole’s Secret Mine in Ardentmill and some hunting maps. It also allows you to refine ores to create items needed for Smithing and Accessory Crafting.
Alchemy allows you to create buff potions and transformation potions using herb oil.
Smithing allows you to create weapons and armor using refined ore. You can eventually learn how to make an Android companion.
Accessory Crafting allows you to create equipment items such as rings, pendants, and shoulder accessories using refined ore.
Using your profession earns you experience in that profession in order to raise its mastery level. Higher levels of mastery enable you to harvest or craft better items.
Some items for further crafting can't be made. Some can be bought from Nack, Ramsey, or Angelica in Ardentmill, others are dropped by monsters.
The Production Skill menu is set to the [B] key by default.

You will gain Fatigue Points while performing profession skills. If your Fatigue Point meter fills up, you won't be able to use profession skills again for a little while. You can reduce your Fatigue points by using certain potions sold by Nack in Ardentmill or by using a Fatigue Reset Coupon from the Cash Shop. Your Fatigue Points will also reduced by 20 each hour, and they will be completely reset to 0 each day at 12 AM Pacific.

Grant is the village elder, who allows you to learn professions.
Saffron teaches Herbalism.
Cole teaches Mining.
Ally teaches Alchemy.
Gere teaches Smithing.
Intaglio teaches Accessory Crafting.

Each profession has a few associated profession-exclusive quests. The second quest for each gathering profession allows you to get an 8-slot bag for that profession. For example, herbalists can get an 8-slot bag that will hold herbs and seeds, but not ores. Note: you can only get one 8-slot bag (Herbalism or Mining), not the other.

Ardentmill

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Herbalism

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Herbalism lets a character gather herbs. After getting this skill, you will receive a shovel that is required to collect herbs. Herbalism can only be paired with Alchemy.

Nodes

Herbalism nodes look like small stems growing out of the ground. When nearby, their names appear underneath. The available nodes in GMS are:

Silver Herb (Marjoram Seed/Marjoram Flower)
Magenta Herb (Lavender Seed/Lavender Flower)
Blue Herb (Rosemary Seed/Rosemary Flower)
Brown Herb (Mandarin Seed/Mandarin Flower)
Emerald Herb (Lemon Balm Seed/Lemon Balm Flower/Peppermint Flower)
Gold Herb (Jasmine Seed/Jasmine Flower)
Aquamarine Herb (Tea Tree Seed/Tea Tree Oil)
Red Herb (Chamomile Seed/Chamomile Flower)
Black Herb (Patchouli Seed/Patchouli Flower)
Purple Herb (Juniper Berry Seed/Juniper Berry Flower/Hyssop Flower)
Gold Flower (randomly spits out several randomed refined oils, Item pot items, and Herb Roots)

Mining

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Mining lets a character gather ores and gems. After getting this skill, you will receive a pickaxe that is required to mine. Mining can only be paired with Accessory Crafting or Smithing.

Nodes

Mining nodes look like crystals jutting out from the ground. When nearby, their names appear underneath. The available nodes in GMS are:

Silver Vein (Silver Ore/Steel Ore)
Magenta Vein (Orihalcon Ore/Amethyst Ore)
Blue Vein (Sapphire Ore/Steel Ore)
Brown Vein (Bronze Ore/Adamantium Ore)
Emerald Vein (Emerald Ore/Mithril Ore/DEX Crystal Ore)
Gold Vein (Gold Ore/Topaz Ore)
Aquamarine Vein (Aquamarine Ore/Diamond Ore)
Red Vein (Power Crystal Ore/Garnet Ore)
Black Vein (Black Crystal Ore/Dark Crystal Ore)
Purple Vein (Wisdom Crystal Ore/LUK Crystal Ore/Lidium Ore)
Heartstone (randomly spits out several randomed refined ores, Item pot items, and Ore Fragments)