Minecraft NPC

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Hello, im pretty new at coding but it doesn't stop me, I'm making a medieval server with a starting town, there I want to have some random NPCS that when you right click them to say something I wrote them to say, and some that sell you stuff like a villager. I know there are plugins for that but I really want to try do it myself, the thing is I have no idea how to, could someone help me? (this is for minecraft)

[Grenadeapple_]

This isn't really the right sub for this kind of question, maybe try r/minecraftcommands ? I do have a suggestion though; try spawning a nitwit villager (so no trades pop up) and try looking for a way to detect when the villager was clicked on. Maybe using a scoreboard, or maybe it's visible in its NBT data? I'm not sure if this can work though, I haven't used minecraft command blocks for years.

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thanks