Don't repeat yourself

"Don't repeat yourself" is a fancy way of saying that you should not do the same thing over and over again when you don't need to. It is like when your mom tells you to clean your room, and you clean the same toy twice. After you clean it, you don't need to clean it again. This is because you already took care of it, and now you can move on to something else.

In programming, "don't repeat yourself" means that when you write code, you should try to use the same code again, instead of copying and pasting it or doing the same thing over and over again. This is important because if you have to change or fix something, you only have to do it in one place instead of many. It also saves time and makes your code easier to read.

So, just like cleaning your room, in programming, you should make sure you don't repeat yourself!