Google Apps Script is one of the easier coding languages to learn (I think) because of several reasons. One is that where you make the code and how you execute the code are in the same place. That is pretty unique.
Google Slides is NOT the place to start coding Google Apps Script. There are some things about it that make it harder than a Google Doc or spreadsheet. Mostly that you have an open canvas instead of rows (paragraphs) in a Google Doc or nice rows and columns that are easy to identify in Google Sheets.
Note: the link will make a copy of the slides because I added code into the script editor for you.