If you're coding it from scratch, don't bother. If you're using wordpress or another pre-baked system, then it's worth having a sitemap plugin (example: Yoast

If you're coding it from scratch, don't bother. If you're using wordpress or another pre-baked system, then it's worth having a sitemap plugin (example: Yoast SEO) or the built-in sitemap (like for Shopify). Submit it to Google Search Console, Bing, and you're done (essentially).