settlers of your settlement can use these vendor stations to barter with you, find these stations like 2 for each type in the workshop modus > crating section.
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the main point of a game is to have fun and enjoy it, so just do that, money is crap
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Just plain barter stations for your settlers, provided you know how to assign them to barter stations in case you don't, in workshop mode, just leftclick-enter the settler, then leftclick-enter the station, aknowledged by settler. not much to it, just have fun with it.