Hello!!

I'm working my way through LFS (1st time) and also studying to take LPIC1.

While learning a lot I feel like I'm missing something.

LFS is great, you sort of get to know how a System is built, which parts you need, how to put 'em together etc.

LPIC1 materials (cbtnuggets & linuxacademy) are also great, but only focus on topics covered by lpic objectives.

I'm new to linux and I'm loving it so far. I'm looking for a book about linux theory in the most abstract (high level) possible manner. I'm no programmer.
Theory about how all those parts (built in LFS) talk to each other, how is the procedure e.g. to opening a file or how in the name of god linux headers work (LFS isn't very good at this, it barely details what they are).

So any suggestion will be appreciated.

These are very specific details, and does not belong to a high level view.

To understand headers you need to learn how a compiler works and how it uses those files.
To "opening a file": you need to understand what is a process, a file descriptor and actually what does "opening a file" really mean. And what does file mean. At first you can find some info about it on wiki pages.

Thanks @pan64 but going to deep (programming) isn't my intention but maybe after having acquired experience with linux I'll give it a try.

On the other hand I've been advised to read "How Linux Works, 2nd Edition: What Every Superuser Should Know".
It seems to suit my needs.

Any other suggestion?

I think you will find a lot of useful information at kernel.org: https://www.kernel.org/doc/html/latest/

So you've asked elsewhere, been given a recommendation and are asking again. Why did you bother asking in the first place ?.
The synopsis for that book looks ok - you have to start somewhere.

You're looking for a book on operating systems theory.

There are textbooks with "Operating Systems" in the title that you can buy.

Here's an excerpt from a book that's much more reasonably priced than those:

https://www.oreilly.com/library/view...2/ch01s04.html

Well I'm asking again because I like to have =! opinions, everyone can recommend anything and perhaps someone knowledgeable might not agree with this or that recommendation.
What troubles you? You don't need to be that rude.

Thank you @frankbell


Thanks dugan!!