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Issue description

The student guide discusses variables in Chapter 2, Section 1, before the topic is introduced in Chapter 4. Moreover, the variables concerned in the inventory section are connection variables. To deliver this effectively, I need to discuss variables at this point and how they are used to configure Ansible behavior, which could be confusing to self-paced learners.

A note stating that variables and special variables are covered in Chapter 4 would be helpful. Also, more details on how Ansible is configured using ansible.cfg, command line options, play keywords, and variables in Chapter 2, Section 4, would be helpful.   I refer to the following when discussing the topic: 

https://docs.ansible.com/ansible/latest/reference_appendices/general_precedence.html

Steps to reproduce:

Workaround:

Discuss variables at this point and how they are used to configure Ansible behavior.

Expected result: