I use this resource, which is FREE. It also has 'Try It Yourself' tabs that help to see what's going on.
You don't make it clear in your question as to whether you just want to learn more about JavaScript or get involved in building applications using JS. I assume your question is related to using JS with Node-RED?
Yeah, I use it a bit too... But I sometimes need physical things to hold.
This "flicking among web pages" does me sometimes. I have about .... 10 x 8 "sessions" of FF and some of those have a LOT of tabs in/on them.
(Luckily I have 32GB me sheep in the machine.)
The w3 school also sometimes take things are read for being understood.
When that happens I spawn anther few tabs.
I know books have a similar problem but you have to actually turn pages.
I'm not sure if it was that or another language I was blitzing the examples, but they didn't have any practical application with what I was wanting to do.
I am not saying I want to spend $200 on a book - knowing I probably won't read it - but the threat of me having it may cause my brain to do it's thing and actually remember something.
(You've probably heard/read the "technician's manual to fixing electronics")
Things like "Wave a multimeter at the device to show it you are serious.
Quote Ohm's law at the device.
and so on.
So I'm wondering if I actually buy another book it may make my brain work better.
You might like to look at this guy. I haven't used his javascript course, but I was on his guinea pig group when he wrote his first course (Ruby on Rails) and he did a great job on that one.