The basis of skipping a strike just refers to one of your strikes being unequal in distance. The idea of inverse (or reverse) is referring to swapping the long & write strategy for the contracts. So for the reverse skip strike put butterfly the trade has a setup of selling 1 otm put, buying two otm puts (but less otm than the first long put), then 1 closer to at the money sell (write) put.
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Long Put (x2)
Equity - Long
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