Puzzling out weapon set passive skill points in Path of Exile 2 is perhaps the most cryptic part of the game I've encountered so far, mainly because the UI doesn't explain it properly. These skill points are a special allotment you can attach to your first or second weapon set, effectively giving you two separate skill trees that are only active when you're using each weapon...
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How to use weapon set skill points in Path of Exile 2
Source: PC Gamer (opens in a new tab)