I use this resource, which is FREE. It also has 'Try It Yourself' tabs that help to see what's going on.
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.