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Just came across this link from the course authors twitter

Javascript: Understanding the Weird Parts - the first 3.5 hours free on Youtube: https://youtu.be/Bv_5Zv5c-Ts

Also has the entire course at 87% off

https://www.udemy.com/understand-javascript/?couponCode=YOUT...

I can second this - even though I have been programming in JS for > 5y, I feel like I have a much better understanding of what is going on 'under the hood' now. I actually bought his other course on AngularJS when I was looking to learn it, and enjoyed it/found it useful enough to immediately buy the vanilla JS course as well. Great stuff!

I highly recommend Kyle Simpson's Advanced JavaScript (available at Frontend Masters and Pluralsight). It's also very good. Actually, just watch everything he makes for Frontend Masters!