-These things will take the power of what you can do to another level, as it allows you to group a certain set of lines of code into a single 'action' to take. Making it reusable in other places as well helping you organise your code, which will help a lot when you start writing more and more code. This also brings us to another principle of programming that we want you to get into the habit of doing, that is the DRY (Don't Repeat Yourself) principle. Read about that [here](https://study.hackyourfuture.net/#/programming/dont-repeat-yourself)!
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