oscar voting

I can’t get a definitive answer on how Oscar voting works: who decides the nominees and who is eligible to vote in which categories for the winners.

Some things I’ve read say that only editors (for example) determine the editor nominees; and then everyone in all categories (actors, directors, etc) vote for the Best Editor. But then I have read other explanations that conflict with that. The Oscar website it strangely silent on the topic. Does anyone have the inside scoop on this?

thanks.

The Academy, as always, has the inside scoop.