Which Widgets Should I Use in My Blog’s Sidebar? (WordPress.org and WordPress.com)

When you log in to your WordPress dashboard and click the Widgets link under the Appearance section of your dashboard’s left menu, you’ll see a big selection of widgets you can add to your blog’s sidebar (or footer, depending on the WordPress theme you’re using). Some widgets are fairly standard from one WordPress theme to the next, but you might see some widgets you’re not familiar with on your list. For example, WordPress. com users have access to a variety of WordPress community-related widgets unavailable to WordPress.org users. Which ones should you use, and why?
 
In this section, I go over what some of the most popular standard widgets do, as well as some ...

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