I recently asked here if I could ask a certain type of DIY question. It received a score of -3 and was eventually closed.
My question: isn't the purpose of Meta to make sure that I ask correct questions in SE?
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Each site in the network has its own per-site meta, e.g. https://diy.meta.stackexchange.com/. That's the correct place to ask whether you could ask a certain type of question on that specific site, and it turns out you already did: Can I ask how to build a chair I saw on the web?. Those questions are off-topic here, because we really can't answer that; there might be some users here who are familiar with DIY.SE, but they are few and far between.
A similar type of question which is on-topic for Meta Stack Exchange are so-called 'site recommendations'. If you need help to find the right Stack Exchange site for your question, you can ask here and tag your question site-recommendation. We'll try to do our best to find the right site, but our opinions by no means guarantee that the question will be welcomed there.