What does "stuff" mean from "ideas of stuff" here? Is it okay to just say "idea" here?
Native speaker’s answer
Rebecca
"Ideas of stuff" is a bit of an awkward expression. Billie Eilish likely means "ideas of (for) things," with "stuff" meaning "things." Stuff is plural, and she has many ideas (thoughts) of things, so the singular form is not appropriate here and we must use the plural form.