WordPress Plugin: Custom Settings Page
Sometimes you may want to create a new custom settings page for your plugin, versus inserting your options in an existing page.
You’ll use
<a href="https://developer.wordpress.org/reference/functions/add_options_page/">add_options_page</a>
to do this.
How to integrate Mailchimp with WordPress – Email Newsletter
Embed a signup form in the middle of a post.
Robots.txt File
Simply Create or Edit Robots.txt File From Your WordPress Dashboard.