ExtremeZ Documentation
Conclusion
Magento engine is a great solution for your online store. The default engine package contains all the modules necessary for successful sales. Open source allows you to offer really outstanding merchant possibilities for your customers. However, due to the quite complex engine structure advanced usage of Magento will require a lot of time and aspiration. You'll need much more than this manual.
The following resources will help you to become a true Magento professional: