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Issue description

 Description:  Hi,
First, thank you so much for providing such in-depth content. My training sessions are littered with aha! moments.
I'd like to make a small suggestion: swap the "Tilde Expansion" heading for the "Brace Expansion" heading in the "Match File Names with Shell Expansions" section of the RHCSA course.
At the end of the "Tilde Expansion" section, you mention how one can "...use the echo command to display the values of brace and variable expansion characters, and others". However, this was already demonstrated in the preceding "Brace Expansion" section.
Doing so would signal to the student that you will use the echo command in the following demonstrations, which aligns with the flow of the rest of the course content. 
Thank you. 

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