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Chaos had yet to understand what Skills could truly be. Aside from "additions" from the System itself, or gifts, or Jobs, and so on, nobody could truly figure it out, but Chaos knew he could steal them from people he ate, sometimes new Skills would also generate based in what he ate, this was thanks to the Unique Skill All-Consumption.
There were also other times he could gain Abilities from others, but that was rarer, Skills was the thing he had the most abundant quantity of, and something that always made him wonder how they worked.
But for now, there was no point in wondering about such things. He may one day find out more about them, but for now he simply wanted to concentrate into other things. Such as the task he had in front of him.
Check "The Protagnist's Sister Is Actually the Strongest"!