1. What is the difference between a void function and a value-returning function?
2. tell the difference between a function call and a function definition?
3. What is a variable’s scope?
4. What is the difference between arguments and parameters?
5. tell the difference between positional arguments and keyword arguments? What is one advantage of each?
6. What is a global variable, and how can they be dangerous?
7. How are value-returning functions useful?
8. What kinds of values can be returned from functions?
9. What is a module, and what is an advantage of separating code into modules?