User Guide
WordPress does a good job of helping you, displaying most used tags and so on.
Use commas to separate the tags.
Categories
These allow you to put your posts into categories. If you intend to blog
frequently this is a nice way to organise your posts.
Use the link at the bottom of the box to add new categories.
Publishing your Post
Finally, click on Publish to make your post appear on the website.
You can return to your website to view your blog posts on the Post page you’ve
set up.
WordPress 3 User Guide" Chapter 5: Posts
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