Google offers extensive documentation for Apps Script on its Developer site, including guides, reference materials, and tutorials to help you build and automate workflows.
You can access it here: Apps Script | Google for Developers.
There are also a range of quickstart samples you can explore — most take under ten minutes to implement and are a great way to get familiar with what Apps Script can do.
Automatically create and send PDFs with information from a Google Sheets spreadsheet
Simultaneously upload and organize files in Google Drive using Google Forms
For more sample projects, go here: Automation quickstart | Apps Script | Google for Developers