Some of the resources in this post are from Sitepoint Premium (meaning you need to pay a subscription fee). I’m sure there are other resources out there, but right now Sitepoint is what I’m using.
Here we go!
Let’s Learn ES6 (Videos by Ryan Christiani)
Express in action (book by Evan M. Hahn)
Try to get into the habit of using a linter like ESlint as soon as possible. It not only helps writing good code, but also helps you to understand why your code might be wrong.
Depending on your code editor, you will be able to install the proper linting plugin.
I know there is a lot to learn out there, but be reassured about the fact that no one can possibly know it all. Just stay confident and on track, work your fundamentals and try not to be distracted by the latest framework/technique.