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How to Get Sitelinks to Appear in Google Search Results
https://www.reliablesoft.net/sitelinks/고급 검색엔진 최적화 기법 및 전략 | Google 검색 센터 | Google Developers
https://developers.google.com/search/docs/advanced/guidelines/get-started?hl=koHow to add robots.txt and sitemaps to Next.js
https://linguinecode.com/post/add-robots-txt-file-sitemaps-nextjs