How do you edit the autocompletion in Atom?


In Atom, you can just type html and the editor will autocomplete a basic html template. I want to edit that template to add some features like <script> <style> and a code that i made that shows a message if javascript is disabled.
I’m working on a lot of small obligatory school tasks which require us to create a new page for every single task, so to be able to edit the autocompletion would save me a lot of time.

Is this possible? Thanks in advance

EDIT: I found a solution to this with the use of file-templates. A package that suited my needs perfectly


This feature is called snippets, you can read about it in the flight manual