Clearing out WordPress dummy content
So here we are on WordPress dashboard and here we have 1 post, 1 comment, and 1 page. Now go to posts and select All posts. Here we can see all posts, with title. From here you can edit your post or move it to Trash. Click on trash and then select trash from here. From here select delete permanently.
Now go to pages, and here you can see all the pages. You can select individual pages or select all at once. Select all by checking title box and select move to trash from bulk action and click on apply button.
Now select trash and again select all and delete permanently from bulk actions and click on empty trash button.
Now go to comments and here we can see that its already empty. Similarly check posts and pages and they both are empty.
So this is how you can clear WordPress dummy content.