Errors
Understand and fix common error messages: what the message means, where it comes from and how to fix it.
What does an error message tell me?
Almost always three things: the kind of error, the file and the line. That usually tells you where to look.
Where do I start?
With the most important line of the message. Jump to the place it names in your own code and skip lines from packages like node_modules.
What if I get stuck?
Look up the message under your topic in the common errors. If that does not help, narrow the error down with one of the ways under Debugging.