Before some form of する, what's the difference between 何 and どう? For example, 何してるの vs どうしてるの? Or 何をしよう vs どうしよう?
Perhaps in many cases only one of the question words is acceptable; then what's a good way to remember which one?
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Sign up to join this communityなに is a nuance-less "what". Anything can fit. どう can be translated as "what" in some context but usually implies the nuance of a way/path (abstractly speaking) that needs to be taken.
何してるの = What are you doing?
どうしてるの = How are you doing? This can be both "How are you?" and "What do you do (in this case)?"
何しよう = What should we do? Like you're bored or need to find an activity, and wondering what you could do
どうしよう = What should we do? There's a situation that needs to be resolved. "We are not making it for the party, what should we do?"