items from one list to another and how to remove all instances of value from list you also learned how while loops can be used with dictionaries in you'll learn about functions functions allow you to break your programs into small partseach of which does one specific job you can call function as many times as you wantand you can store your functions in separate files by using functionsyou'll be able to write more efficient code that' easier to troubleshoot and maintain and that can be reused in many different programs