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If you have only recently starting working with Joomla you will probably have experienced the pain of learning a new system. New terminology, new ways of doing things, perhaps even the web itself may be new to you. Then let these guides relieve some of that pain.
Any users on Joomla 1.6 should upgrade to Joomla 2.5 immediately as there are known security risks and bug fixes in 2.5. There will be no backwards compatibility issues if you make this upgrade from 1.6 to 2.5. For more information see the Joomla 1.6 category page.