Do all pages need to be placed in the sitemap?

Question

Create a sitemap

Hello! There is a site with ads. Do I need to add every ad to the sitemap? Or is it enough that search engines simply view the page with links to ads more often, and they will index the pages with ads themselves?

Answer 1

If everything is simple with links within the site, you can even not do a sitemap.
If everything is complicated (dynamic loading for example), then add everything.