Engineering Goggles

Hi Guys just wondering how this system works. So do I craft the base version then it unlocks the next tier of the goggles? Are all the recipes trained from the trainer and also is it worth it? Thanks.

For the end game BfA gear, the first item is learned by the trainer or through the recipe drop from N’zoth cultists (for the latest tier goggles). Once you craft the first level goggles, the next goggle in that group is learned automatically. When you craft the new goggles you learn the final stage recipe.

Are nzoth cultists just a random mob in a zone?

They are humanoids found in the Black Empire assault zones (that switch between the Vale of Eternal Blossoms and Uldum weekly) that are not the Mantid, Mogu, or Tol’vir.