The Github site for Airtable.js lacks too much information for beginners. The README explains almost nothing.
However, I did look at the test.html file and was able to make a very basic test of my own. But, other than looking at test.html, how do you discover what Airtable.js can do?
I agree, there isn’t any real documentation for the Airtable API on github, and you can only guess how some of the methods work by looking through airtable.js itself, which is too complicated.
Since the Node client utilizes the Airtable API, what I would suggest is to first read into the Airtable API documentation (The REST based version) to get a good idea of what you can accomplish with the help of the API, and after that check out the Node client for Airtable.