At some point when playing Stardew Valley, you may need to get Ectoplasm from a special delivery quest for NPC Wizzard; That said, here's where and how to get ectoplasm in Stardew Valley.
Where to Get Ectoplasm in Stardew Valley
To get ectoplasm in Stardew Valley, you need to find and defeat ghost enemies that spawn in the mines between levels 51-79. If you're having trouble fighting them, the best strategy for fighting them is to simply stand still and run hit them with them. your gun just before it hits you.
By hitting them, the ghost will teleport to a new location and come back to you; when this happens, just repeat the same step until they die.
Each Ghost you kill has a slight 9,5% chance to drop the Ectoplasm you need. Ghosts also seem to spawn infrequently, so you might have trouble finding them.
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Luckily, there's another version of ghosts you can try farming; they're called carbon ghosts, and they tend to spawn on mummy levels in Skull Cavern. Carbon Ghosts also have a 9,5 chance to drop Ectoplasm, and they also drop omi geodes quite often, so if you want those geodes, they're a good enemy to farm.
That being said, once you have an ectoplasm, you will then need to give it to the wizard; you can do this by simply finding the wizard at the wizard tower as shown above and offering the item to him.
For more on Stardew Valley, we at PGG have a growing list of guides like how to bait a crab pot and how to upgrade tools in Stardew Valley.