It is essential to add an image to describe your blog content properly to the audience. That means your featured image presents the overview of the post-story. In WordPress, you can easily add an image to the post.
Here go the steps.
Step 01. Login to the WordPress dashboard.
Step 02. From the menu, navigate to Post>>All Posts >> Add New.
Step 03. Now, add the post title and description. On the right side of the page, you will get an option to add a featured image. Click on that option, and a gray “Set featured image” box will appear. Click on that box to add the featured image.

Step 04. You can choose an image file from the existing Media Library or Upload a new one.

Step 05. Once the selection has been completed, click on the “Set featured image” button.

06. Finally, click the “Publish” button to save the settings.