Thank you @ms. Just to make clear, should I cite to both sitemaps in example.com/robots.txt? The blog sitemap is in the blog directory

My website has 13 pages, the blog section on my website has 46 pages. The blog has an XML sitemap that is automatically generated at "website.com/blog/sitemap.xml". Should I have 2 sitemaps, one for the main site and one for the blog? Or should I just have one sitemap for the blog since the main site doesn't have many pages?

If I make 2 sitemaps, should I mention them both in website.com/robots.txt? Or mention one in website.com/robots.txt and the other in website.com/blog/robots.txt?

Really appreciate any help with this.