If you just installed WordPress on your new website you will find there is some example content installed as well.
This sample content are the Hello World blog post and the About page.
Remove Hello World
Getting rid of this Hello World post is easy if you know how.
Login to your WordPress Dashboard and go to Posts -> All Posts
You will see a list of Posts that are on your site as you start writing your own articles. For now there is only one post with the title Hello World.
Underneath the Hello World Title you have the Trash option, click that to move the post into the Trash bin of WordPress.
After you have done that, you will see another option appear next to All called Trash (1).
Follow that link and click on the button called Empty Trash. Now the WordPress Hello World is really gone from your WordPress website.
You can do the same with the About page if you want too, just go into Pages -> All pages.
Changing The Uncategorized Category
Before you start writing your own articles you need to change one other option in the WordPress default setup.
You need to rename the default posts category Uncategorized to something more fitting to your website topic.
To do that you go to Posts -> Categories and click on Edit.
You cannot remove this category as it is set to be the default in Settings -> Writing and WordPress needs at least one posting category, so you need to edit it.
Change the Name Uncategorized to your own primary blog topic, I change mine on this site to WordPress Manuals.
Then clear out the uncategorized text in the Slug field and Save your changes. WordPress will create a new Slug for you based on the content of the Name field.
If you go back into the Edit screen you will see that new Slug.
You can create new categories if you want to create a couple of nice containers for your articles to fit the topic of youw new WordPress site.
So after you changed the Uncategorized option you are now ready to start writing you own articles by going to Posts -> Add New give your new post a title and write your fresh content.