Warning: No outbound links appear in this page, consider adding some as appropriate.
Outbound links are links that point to some other domain from within your site. Your site should contain outbound links. If you don’t have any outbound links, it might affect your ranking negatively.
To get a green bullet, you’ll have to add at least one outbound link in your post.
Follow and nofollow
By default, Google follows every link on your site. If you don’t want Google to follow a specific link, you can use a nofollow link. A nofollow link provides a way for webmasters to tell search engines “Don’t follow links on this page” or “Don’t follow this specific link.”
Related: Warning: no internal links appear in this page, consider adding some as appropriate.