variable names are usually lowercase if there' more than one word in the variable namecapitalize each word after the first this makes your code more readable for examplethe variable name whatihadforbreakfastthismorning is much easier to read than whatihadforbreakfastthismorning this is conventionan optional but standard way of doing things in python programming short variable names are better than long namesbreakfast or foodthismorning is more readable than whatihadforbreakfastthismorning this book' interactive shell examples use variable names like spameggshamand bacon this is because the variable names in these examples don' matter howeverthis book' programs all use descriptive names your programs should use descriptive variable names too summary once you learn about strings and functionsyou can start making programs that interact with users this is important because text is the main way the user and the computer will communicate with each other the user enters text through the keyboard with the input(function the computer will display text on the screen with the print(function strings are just values of new data type all values have data typeand there are many data types in python the operator can concatenate strings functions are used to carry out some complicated instruction as part of your program python has many built-in functions that you'll learn about in this book function calls can be used in expressions anywhere value is used the instruction in your program that python is currently at is called the execution in the next you'll learn more about making the execution move in ways other than just straight down the program once you learn thisyou'll be ready to create games