It makes sense to set individual pages of your website to "noindex" from the outset. This includes for example: General terms and conditions, privacy statements, imprint. These pages contain information that is important for the user of your website, but is not specifically searched for on Google. So that these pages do not land in the ranking before the important content of your website, you can set these with a clear conscience on "noindex". You can also exclude pages with similar or duplicate content here.