Step 1: Navigate to Country> Add Country in your WordPress admin sidebar.

Step 2: Create a title, and insert your post content in the editing field.

Step 3: Add Categories from the right side.

Step 4: For a single image, click the first Featured Image Box, select an image and click the Set Featured Image button.

Step 5: Country Settings for service extra info.

Step 5: Add your post excerpt.

Step 6: Once you are finished, click Publish to save the post.

Here is the screenshot that shows the various areas of the Countries post page:

If you need to display Countries posts using Elementor, please use the Country Post, Country Tab Elementor Widget.
You can easily add it through the Elementor page builder, as shown in the screenshot below.