Shit shoveling
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[This page needs more content : List of the brahmins pens, more details, advices, etc]
Shit shovelling is a good way to earn caps.
Go to a city and find a brahmins pen, then ask the herdsman if he needs help. Ask him a shovel, go clean some brahmin shits, and then talk to the herdsman again. Each brahmin shit shovelled will give you 10 xp and 10 caps.