WordPress Writing Settings
The writing settings screen controls the writing experience and provides options for customizing the WordPress site. These settings control the defaults for Post Category and Post Format, as well as managing Update Services.
Open Administration > Settings > Writing:
Default Post Category
The Category you select from this drop-down is called the Default Post Category.
The Default Post Category is Category assigned to a post if you fail to assign any other Categories with writing your posts. If you delete a Category, the posts in that Category will be assigned the Default Post Category.
The only category after WordPress initial install is Uncategorized.
You can create new category, for example Blog and make it default. But you can edit Uncategorized into Blog (why anyone should keep uncategorized category?).
Open Posts > Categories:
Hover over Uncategorized link and click Edit:
Replace Uncategorized with Blog (or any other suitable term, for example News):
Check if the default post category is properly changed:
Default Post Format
The Post Format you select from this drop-down is called the Default Post Format.
Post Formats are used by themes to create different styling for different types of posts. This settings is only visible if the current activated theme supports Post Formats.
The WordPress Twenty Seventeen theme is an example of a theme that supports various Post Formats including Standard (no special format), Aside and Gallery.
Post via email
The built-in WordPress functionality is deprecated and will be removed in an upcoming release. To have this functionality on your site you must use a plugin.
Update Services are tools you can use to let other people know you've updated your blog.
WordPress automatically notifies popular Update Services that you've updated your blog by sending a XML-RPC ping each time you create or update a post. In turn, Update Services process the ping and updates their proprietary indices with your update.
WordPress makes this easy for you by listing Ping-O-Matic's server
rpc.pingomatic.com by default.
If your Search Engine Visibility is set to Discourage search engines from indexing this site:
the message WordPress is not notifying any Update Services because of your site’s visibility settings is displayed:
Of course if you enable Search Engine Visibility by unchecking the box in Settings > Reading:
Now people browsing sites like Technorati or Sphere can find your most recent posts!
If you add more services make sure they are separated with line breaks within the form.
Click the Save Changes button to ensure any changes you have made to your Settings are saved to your database. Once you click the button, a confirmation text box will appear at the top of the page telling you your settings have been saved.