Prevent Site Content From Indexing (No Index)
For best SEO practices, all site content should be able to be found by search engines (i.e. indexed). But if there are certain blog posts or files that you want to hide from search engines, you can do this in the site editor.
Blog Posts
Setting a blog post to no index will stop that post from appearing in search results or being indexed. To do this, click on Blog in the side menu, find the blog post you would like to hide and open its settings (gear icon), scroll down to the bottom and toggle Set post to no index.
Uploaded Files
Setting an uploaded site file to no index will stop a file from appearing in search results or being indexed. To do this, locate the file in Content > Media Manager > Files tab, and enable the Set file to no index option on the right side of the window.