Updated : May 27, 2010
Not categorizing and tagging the content in your blog posts is like purposely playing hide- and- seek with search engines and therefore, making it difficult for their users to find your blog. By organizing your content by categories and tags, you are not only making it easier for your existing readers to navigate through your site, but you are also telling the search engine spiders how to index your blog to bring in more readers.
Categories are broad: tags are narrow and specific
Keep your categories as really broad keyword and topic headings, and assign keyword tags as finer and more specific ways of indicating what a post is about. If I used a book as a metaphor, the categories would be like the chapter titles in the front of a book, and the tags would be like the words in the index.
Categorizing and tagging your posts allows you to assign relevant keywords to your posts. When you assign categories think in terms of words people would expect to see in a Table of Contents. When you assign tags to your post think in terms of words people would look up in an Index in the back of the book.
Let’s try some examples:
Categories and tags example 1:
Suppose you write a post about a family and friends camping and fishing trip to a well known river.
First think of the table of contents in a book.
Now think of the chapters as being broad categories.
Categories: Camping, Fishing, Rivers
Second think of the index in the back of the book.
Now think of the index terms as being narrow semantic tags.
Tags: friends, boats, brother, father, mother, sister, sports, fly fishing, Well Known River.
Categories and tags example 2:
Suppose you write a post on baking the perfect pineapple upside down cake.
Categories: Baking, Food and Recipes.
Tags: cakes, desserts, pineapple, pineapple upside down cake.
For a deeper understanding here is a synopsis of the similarities and differences between tags and categories provided by Lorelle in Categories versus Tags: What’s the Difference? and in Categories are not tags: Got it?
- Categories can have unique names. Tags need to be known names.
- Categories can have long wordy names. Tags should have short one, two, or at the most, three words.
- Categories generate a page of posts on your site. Tags can, too, but often generate a page of off-site posts on an off-site website.
- Categories are not tags. Tags can be categories.
- Categories don’t help search engines find information. Tags help search engines and tag directories catalog your site.
- Posts are usually in one to four categories. A single post can list as many tags as you want.
- Categories help visitors find related information on your site. Tags help visitors find related information on your site and on other sites.
- Categories organize, hierarchically. Tags need not.
- Tags provide meta-information, Categories need not.
- Tags cross-connect, Categories do not.
Blogging tips:
- Use only relevant categories and tags on your posts. Remember garbage in – garbage out.
- Don’t overdo it! It’s unlikely that any post will ever requires more than a total of 12 categories and tags. If you go overboard you will be consider to be a “spam-dexer”. See > Global Tags
References:
Categories can be arranged in a hierarchy. Tags, however, exist in their own right and have no set relationship to anything else. Categories vs. Tags
Discussion questions:
(1) Have you been assigning categories and tags to your posts?
(2) If so, then how you determine which ones to use?

philtaxation
July 25, 2009
thanks for the tips, simple but credible…
Dorothy Stahlnecker
July 25, 2009
this is great information David and I will review this together we’re having a comment issue right now so I hope you’ll come back after we fix it.
Thanks so much..
Dorothy from grammology
grammology.com
PearlTrader
July 26, 2009
timethief,
Thanks you so much for writing on tags and categories.
I use blogspot for blogging can you please further explain using categories on a Blogger blog.
jeanhasbeenshopping
July 26, 2009
This makes sense to me, but I do have a question. After I read your blog, I began to clean up my categories and tags. I have a category for photography, tagged as Arizona. With WordPress’s tag surfer, would I also have to include the word Photography as a tag? Would my PhotoShop category have to include PhotoShop as a tag?
Lena
July 27, 2009
Great advice. This is sthg I’ve been wondering about. In the past I used to tag all my posts but on ‘tidying’ up my site thought that they were unnecessary since I wasn’t using a tag cloud and believed categories were enough for search engines. How wrong I’ve been. I’m off to add my tags! thanks for this advice!
Teresa Schultz
July 28, 2009
Still so much to learn and do! My blog is almost 30 days old, has 30 posts on it, but all uncategorised. I know I need to get around to sorting out categories for my posts, and your blog post is helpful. Thanks.
wheng
July 29, 2009
timethief,
Thank you for this very informative tips. At least now, one of the questions in my mind was cleared up. It will be easier for me now to use the right category and tags.
Kristen
June 9, 2010
Thanks! I have no idea what I’m doing so this is so helpful!!!
timethief
June 9, 2010
@Kristen
The blog linked to your username is a Blogger (blogspot) blog and you can assign “labels” to your posts. WordPress blogs have Categories and Tags features so I’m not sure about how helpful this post will be for you. Best wishes with your blogging.