Enchanters have a very special way of getting new recipes outside of the Profession Trainer that doesn’t require to knock a dungeon around senseless over and over again; as was the case with dungeons in WoW Classic and Burning Crusade. All you need to do is disenchant any green item drop you find from farming mobs or from the quest rewards to acquire Dream Shards.
This is a form of currency for Enchanters, similar to how you use Emblems of Heroism or Emblems of Valor to purchase armor, trinkets and weapons. In this case, Enchanters use Dream Shards to purchase new recipes from a vendor. You can find Vanessa Sellers (Shard Vendor) at the Simply Enchanting building, next to the Violet Citadel in Dalaran at the Magus Commerce Exchange district. The catch is that you need to have Enchanting 425 to purchase and train the first recipes. A good incentive to dust off and start leveling your Enchanting profession.
Below you can take a look at all the Enchanting recipes available from this vendor.
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Dream Shards disenchant from BLUE items not green! That makes everything just a little more expensive than the article gives the impression.