Are questions about the usage of spreadsheets in general ok for this site?

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Personally I believe those questions to be fine here, as well as those which are specific to LibreOffice. In this line, I suppose that only questions specific to other suites are off-topic here. We help LibreOffice users, and they may have both general and specific questions, and they might not (and don't have to) know if a specific question generic or specific.