Amaury Balmer

For WordPress 2.3 and upper : Please try and use <a href="https://wordpress.org/extend/plugins/simple-tags/" title="The best tagging plugin for WordPress 2.3 !">Simple Tags Plugins</a>
The two mostly used tagging plugins are the Ultimate Tag Worrior (UTW) and Jerome’s Keywords.
I think most people use UTW, however especially its performance has been criticized in the past. Also, it does not provide a auto-complete type-ahead dropdown menu when tagging posts but it always displays all tags of the entire WordPress installation which can be quite annoying if you have really many tags.
Jerome’s Keywords is unfortunately still in beta and it seems that the project will not be continued.
With Simple Tagging Plugin, I’ve coded another tagging plugin for WordPress which is based on Jerome’s Keywords plugin and can ”’import”’ all your tags from UTW or Jerome.
It provides you with everything you need for tagging, in the following a list of the features:
<ol>
<li>Import your tags from UTW or Jerome’s Keywords</li>
<li>A field for tagging your posts easily incl. type-ahead feature</li>
<li>Display Tags of the current posts</li>
<li>A tag cloud with various options</li>
<li>Displaying a list of related posts</li>
<li>Related Tags feature when browsing your tags (idea stolen from del.icio.us)</li>
<li>Adding tags (& categories if enabled in the options) as meta keywords in the header</li>
<li>Adding tags as categories in the feed (this will index your tags with Technorati)</li>
<li>Tag management: rename tags, delete tags, replace tags, convert categories to tags, etc.</li>
<li>Support of embedded tags ([tags]tag1, tag2, tag3[/tags]): You can tag posts directly by entering the tags in the post using [tags]tag1, tag2, tag3[/tags]. This makes it possible to tag posts when you use an external blogging application like BlogDesk or Windows Live Writer.</li>
<li>A feed (RSS, RSS2, Atom) for any tag</li>
<li>Tag cloud for specific category</li>
<li>Automatically display the tags of a post after the post content</li>
<li>Generate Tag Tabs with jQuery !</li>
<li>Manage Tags Cloud in FULL WordPress Mu Site !</li>
<li>List posts from all blogs for a specific tags in WordPress Mu !</li>
<li>Edit mass tags ! 20 posts at the same time !</li>
</ol>
And more…
<h3>Arbitrary section</h3>
New in version 1.7: 
 * Reorganise Admin Options 
 * Add Tag Tabs 
 * Fix lots of bugs. 
 * Fix test $wp_version 
 * Atom Feed fix 
 * Add mass edit tags ! 
 * Fix a security problem
New in version 1.6.8.1: 
 * Fix a important bug with related posts
New in version 1.6.8: 
 * Fix bugs version 1.6.7 
 * Fix wrong counter tags 
 * Admin bugs. (checked) 
 * Minor optimisation 
 * Site wide tag cloud for WordPress Mu + List of posts. 
 * Add translation: Russian & Czech
New in version 1.6.7: 
 * Fix bugs version 1.6.6 
 * Compatibility with MySQL 4.0 
 * Optimisation
New in version 1.6.6: 
 * Add auto color tags cloud (no CSS, Colorpicker in admin) 
 * Add Turkish translation 
 * An option to limit the number of related tags 
 * A possibility to call/display the related posts outside a loop 
 * Tags Feed 
 * limit the age of what posts show up in the tag cloud 
 * An option to automatically display the tags of a post after the post content 
 * Limit or exclude category or categories in Tag Cloud 
 * Ability to exclude specific categories from the related posts 
 * Tag Cloud for one category
New in version 1.6.2: 
 * Related Posts now work…
New in version 1.6.1: 
 * Internationalisation (french, english, german) 
 * Compatibility with WPmu

Simple Tagging

For WordPress 2.3 and upper : Please try and use [Simple Tags Plugins](http://wordpress.org/extend/plugins/simple-tags/ "The best tagging plugin  …

Freemius

Pagup

Sajjad Ali

Meta tags provide information about the webpage in the HTML of the document. This information is called "metadata" and while it is not displayed on the page itself, it can be read by search engines and web crawlers. Search engines such as Google use metadata from meta tags to understand additional information about the webpage. They can use this information for ranking purposes, to display snippets in search results
According to John Mueller (2017):<a href="https://en.wikipedia.org/wiki/Meta_element" rel="nofollow ugc">Meta Tags</a> can affect the way that users see your site in the search results and whether or not they actually click through to your site.
Meta Keywords are a specific type of meta tag that appear in the HTML code of a Web page and help tell search engines what the topic of the page is. Meta keywords are distinguished from regular keywords because they appear "behind the scenes," in the source code of your page, rather than on the live, visible page itself.
META Keywords play a helpful part in communicating your message and attracting searchers to your site. And in the competitive world of search engine marketing, every little bit helps.
For example, Yandex (<a href="https://yandex.com/support/webmaster/controlling-robot/html.html" rel="nofollow ugc">META TAGS that Yandex takes into account</a>) and Baidu use the meta keywords element to determine the page's relevance to search queries.
How it works
META TAGS for SEO plugin allows to deploy illimited & customized META tags (mainly META Keywords) everywhere on your website or on specific pages/posts/custom post types/product pages depending on your content (for SEO purpose).
Note: this plugin is mainly dedicated to deploy custom META Keywords (for SEO) based on your content. However, you can use the "Custom tags" (PRO version) area to add any other custom tag.
<ul>
<li>Click on "Add new META"</li>
<li>Select the value (Keyword) – (or "Copyright", "Author" with PRO version)</li>
<li>Enter any content as META Keyword (not required IF using "Focus Keyword", "Add post title" or "Add site Title" feature)</li>
<li>Select where to apply this META tag (everywhere, pages, posts, product pages, custom post types, …)</li>
<li>You can choose to use the Yoast Focus Keyword OR the Rank Math Focus keyword as META Keyword (please note that if using this feature, each METa Keyword will be different depending on the "Focus keyword" used on each page, post, product page, …)</li>
<li>Add post title as META Keyword (please note that if using this feature, each META Keyword will be different depending on the "post title" used on each page, post, product page, …)</li>
<li>Add title as META Keyword</li>
</ul>
You can now preview how your META Keyword looks once deployed.
Once done, you can:
<ul>
<li>Duplicate this META keyword and select another "Post type" (for example, "posts" instead of "page", if selected previously)</li>
<li>OR click on "Add NEW META" and create a brand new one.</li>
</ul>
Once done. Click on SAVE.
Note: if required, when using PRO version, you can disable locally META TAGS for SEO (if you don't want one of these META TAGS to appear on a specific page)

Auto SEO META keywords (META tags keywords) optimization + WooCommerce

META TAGS for SEO allows you to display custom META Keywords strategically (based on Yoast / Rank Math in some cases) to boost your ranking on search  …

Simple Tagging vs Auto SEO META keywords (META tags keywords) optimization + WooCommerce