Infinite resources
As I have already mentioned a few times, JavaScript is a very popular language; there are thousands of websites that show us examples and explain methods and functions.
We must add all the forums and Q&A sites that return many results when we search something on Google to these websites (or any other search engine), and that is actually an unforeseen difficulty.
It happens quite often that we find false information or code snippets that simply don't work, either because they have typos in them or they are so badly written that they work only in a very specific and peculiar situation.
My personal solution is to use only a couple of websites and perform a search on their search engine, avoiding all the sources I'm not sure of. Maybe I miss something at times, but at least the information I get is trustworthy.
Last but certainly not least, the help forum recommended by the Google Apps Script team, http://stackoverflow.com/questions/tagged/google-apps-script (with the google...