The scripting language is vanilla Javacript that you can learn from the internet there are plenty of resources. Point to note that this is quite an old version of JS so the fancy features like arrow functions won't work. Basic things like strings, array, object, prototype inheritance, etc work the same as on the web.
Once you are comfortable with the language, you need to study a bit about the anatomy of an InDesign document, on this front studying the DOM documentation would help. Try to understand by making an association with the objects you see and the objects mentioned in the documentation, this will help you visualize how things are working.
Regarding sample code, you can look at the sample scripts shipped with InDesign, accessible via the Scripts panel. Right click any script and choose edit script. Now you can see the code
Also this forum is a treasure trove of helpful information on scripting, if you are stuck, search on the forum more often than not you will land on something helpful.
Hope this will get you started
-Manan
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