Video tutorials from OSTraining to help you understand, learn and use Joomla.OSTraining offers some free resources. If you like their training style, you can purchase other tutorials from them by going here.
A walkthrough and explanation of Joomla:
From RocketTheme.com (template creators):
A responsive design automatically adapts itself to a particular viewing environment such as desktop, tablet or mobile, without the need for separate layouts for varying platforms
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