WordPress Post Tags

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Tags are keywords that can be assigned to a post. Tags are independent of each other have no hierarchy like a parent and child relationship.
Tags can be created when writing a post or they can be created in the Posts Tags screen where they're also be managed.
The screen is divided into the Add New Tag section. the Tag Table and a Popular tags cloud that will only be visible when tags are added to posts.
Each of these Tags in the tag cloud can be clicked to edit that Tag.
To add a new Tag enter a name in the name field.
The Tag slug must be unique. WordPress allows the tag name to have a duplicate if you use a unique slug. The "slug" is the URL-friendly version of the name. It is usually all lowercase and contains only letters, numbers and hyphens. You can assign a slug in the Slug field or leave it blank and WordPress will created one for you.
The description for the Tag is optional and may be used by some themes or plugins. Even if they're not used by the active theme, you may still find this useful since you can search this description to find a certain tag.
Click the ADD NEW TAG button to create the tag. The Tag will then appear in the TAG TABLE.
The TABLE lists all Tags by row. You can use the SCREEN OPTIONS TAB at the top of the screen to edit the TAGS TABLE heading and to control the numbers of TAGS SHOWN in the table. Un-check any box you want to hide or check any box that you do want to show in the table. To control the number of TAGS listed in the table enter the number in the box and click APPLY.
The table can be sorted by any of the heading. The name of the tag is what appears on the site. And below the name is the action line where a tag can be edited, edited using the quick edit, deleted or viewed. Tags can be deleted without affecting the posts.
Description shows what was entered in the Description filed when creating the tag. It does not show on the site by default but can be used by some themes or plugins
The slug is what was entered in the Slug field either by you or by WordPress.
And Posts is the number of posts with this tag. Click on the number to be directed to the All Posts Screen to manage the Posts for that tag.
The BULK ACTIONS is available for performing an action to several tags. Select the tags, the action and click Apply.
And by entering keywords in the SEARCH box at the top of the page the table will list any tags that meet that search criteria.
Just below the TABLE is a link to convert tags so they can be used as categories. If you click on this link it takes you to the Tools IMPORT screen. On the list is a CATEGORIES and TAGS CONVERTER which will then take you to an install page for a plug-in that handles this conversion.