Help me understand damage and repair costs?

So I appear to get slight damage either through fast travel or just simply existing.
I’m a bit OCD and I will always check and repair before I head out of a village. But sometimes I’ve not done anything other than move stuff around through fast travel, or just left the game AFK while I do things in reality.
So why’s that? I assume there is fall damage, and combat damage. What else?

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