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Issue description

 In chapter 2, it should be made clear that Ansible supports  variables differently : simple variables referenced using {{ }}, dictionary variables that are not referenced using {{ }}. This is explained in the Ansible documentation but not in the text of the course. I realized this later in the course when I didn't understand why the {{ }} was not used in some examples and labs. Also it should be made clear that registered variables can be of different type and one must check this in the module documentation. 

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