WordPress Tags are not the same as WordPress Categories
Simply explained, if categories are your table of contents, tags are your index.
Categories and Tags are there to help your visitors navigate through your content. They sort and group your content to make it easier for your visitors to find related information.
Categories and Tags are for your visitors, not just search engines. Think of your visitors’ first. They are not a place to be imaginative. Keep it simple.
Categories are your site’s table of contents.
Categories help identify what your site is about, they are not for you, they are for your reader and need to be specific enough to help visitors easily find what they’re looking for.
I suggest you use keyword to name your categories where it’s appropriate.
Tags are your site’s index. They act like sub-categories for your content.
Every post in WordPress can be filed under a number of different Tags. They help visitors to navigate and provide a way for posts to be grouped with other posts with similar content.
Tags can be displayed with each post. When someone clicks on a Tag link, a Tag archive page with all the posts identified with that Tag, will be displayed.
You can add the Tag Cloud Widget to the sidebar to display all the Tags you use in a cloud. The size of the tag in the cloud depends on the number of times you have used it
Don’t over tag
When thinking of tags ask, “What does it tell my reader about related posts? The idea of tags is to direct your readers to related content.
Tagging strategy
Think about all the things you might write about for each category, these are your sub-categories or tags, list them as tags you might want to use.
You can add to your list as your site develops. Don’t just add in random words that might fit. The idea of tagging is to provide more routes to your content.
Search engines don’t use the the rel="tag" which identifies a tag in their ranking algorithm so don’t be concerned about SEO when tagging.
Your main concern needs to be providing a useful index.
Today's post was written in response to this Question:
What I've been doing in the past for tags/keywords is to put in all terms that I think are relevant to the content, rather than just a handful of main keywords. Is that advisable or does that put Google off?
For example if I write a post about productivity the content might have things like time management, procrastination, focus, but also it might touch on motivation, goal-setting, flexibility, school holidays and fun!
Appreciate your insight.
The keyword tag in all in one SEO
Simply list keywords found in the post, don’t stuff every keyword you can think of in here, just the main keywords for the post. Google doesn't pay much attention to the keyword tag, the other search engines still factor it into their ranking algorithm.
I hope that's cleared a few things up about Wordpress Categories and Tags.
If you have other questions you'd like to know the answers to just leave your question as a comment and I'll get back to you wirh an answer.