We no longer recommend NextGEN Gallery. Instead, we recommend using the default image gallery with custom styling and/or plugins like Lightbox Plus.
The WordPress SEO plugin is, quite simply, the best SEO plugin available for WordPress. If you use this plugin, you will probably not need any other SEO plugins. The author, Yoast (a.k.a. Joost de Valk) is a highly respected WordPress and SEO expert, and his plugin gives you the tools necessary to effectively optimize your WordPress website.
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We no longer recommend J Shortcodes. Instead, we recommend Beaver Builder.