As a newcomer on the site (just joined 3 days ago), it took me several hours of roaming around to accidentally find this very useful bird's eye view of FAQs on Meta: FAQ: Frequently Asked Questions and Reference Answers It also took me a while to think of searching through tags of topics I am interested in.
When clicking "Ask a Question" on the main ethereum.stackexchange.com, a window pops us that says "Is your question about Ethereum, the decentralized application platform and smart contract enabled blockchain? We prefer questions that can be answered, not just discussed. Provide details. Share your research. If your question is about this site, ask it on meta instead."
Could you perhaps add a couple of lines and links (before "Provide details") to the effect of: Before asking your question, please look up keywords (top right box), relevant tags, and this FAQ page to make sure your question has not already been answered. If it hasn't, provide details about the challenge you face. Share your research etc..."
Or does anyone have better ideas for how to support newcomers to find existing answers to their questions, and avoid unknowingly duplicating?