i neither agree or disagree with what's been said thus far

to me the issue is this

"I really want to understand the guitar neck , how players improvise, all the relations between chords and scales..."
(To me the implication of the question is an unspoken "and THEN I can [do what I want to do]")

Right on

However:

That's what everyone wants; and the real masters are still wanting that; till they die.

That's why B.B.King and John Mayer both at points completely stopped what they were doing to just appreciate what Trucks was doing.

Trucks was there because B.B. King was a huge inspiration and education for him
B.B. King invited him; because he was still in the attitude of appreciating thus learning.

"What's this cat doing? Why is it so beautiful?"

There is no end to it.

The degree one gets that...

Is the degree one will just relax and focus on absorbing information; from whatever resources are speaking to you.

And that... is a lot like relationships (platonic & romantic)

you might start talking to someone and know instantly: not my thing

other times...  not so much.

the Truth of music is observable in every part of it
we understand parts to the degree we understand the whole to the degree we understand the parts
and how many different angles we're looking at it from 
zoom in
zoom out
move around

recommendations of specifics of steps and path is all in context of the cat sharing in context of their particular evolution.
No one can tell you who your best friends will be; you just have to explore.

You don't need to commit blindly either.
Just take it all one moment at a time.
Make your journey about time invested not courses completed.
and trust the process