If you use Gmail, Google Sheets, Docs, or other G Suite apps, With Google Apps Script, you have a chance to build something useful tools and you can automate a boring tedious task with no cost and there is no configuration or Setup required.
App Script can only automate tasks across Google products and third party services and build web applications, other than that we can't use apps script anywhere else.
Always remember to consider that you will need to transfer all the App Scripts created or support by you to the next person who is going to take over.