There is one extension that we install on every single Joomla site build.
Joomla Content Editor.
JCE has been around since 2006 and has been outstanding since it's launch. It makes everything easier when you're writing Joomla articles: linking, formatting, adding images, spell-checking, create tables and much more. It's built by Ryan Demmer at http://JoomlaContentEditor.net.
So, it made sense for us to sit down and write the Ultimate JCE Guide. I used JCE of course.
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