Explain convention of starting/finishing each shape in same position
Edit explanation of help() function
Explain first function example using terms from introductory spiel
Add some detail to explanation of whitespace indenting & code blocks
Add suggestion to use built-in help for 'range' function
Minor edits
Clarify factorizing of code, motivation for arguments
Reformat explanation of conditional statements to echo Python's block layout
Add a specific example of data munging functions
Add some explanation for 'infinite loop'
Add a bonus question about converting infinite loop style to use a loop conditional