To start with, "The C Programming Langauge", Kernighan & Richie (K & R) [1]. Find the latest edition that you can buy.

I think the primary topic to master in C is pointers. This is where most falter. It takes a few years to "master" (if we ever do). Here I would recommend "Understanding and Using C Pointers", Richard Reese. [2]

If you are interested in networking, any of the classic "TCP/IP Illustrated Vols I/II/III", W. Richard Stevens, [3] contain a ton of C code to implement components of TCP/IP.

If you are interested in Graphics, then "Graphics Gems", Andrew Glassner [4] is a good source.

"An Introduction to GCC", Brian Gough, [5] to understand the tooling and its various bells and whistles.

My learning swimming by jumping into the deep end of the pool experience was realized by learning Windows Programming using the Charles Petzold book and navigating through Microsoft Foundation Classes in the late 80s/early 90s. The state of the art in tooling wasn't that great in those days and I spent months with the book to get things going. This was done after I had built a foundation with K&R and a decent amount of Unix network programming.

I see a lot of the other posts recommend more modern books. But you still need to build your foundation on C and Pointers in particular.

Good luck on your journey.

[1] https://www.amazon.com/Programming-Language-2nd-Brian-Kernig...

[2] https://www.amazon.com/Understanding-Using-Pointers-Techniqu...

[3] https://www.amazon.com/TCP-Illustrated-Protocols-Addison-Wes...

[4] https://www.amazon.com/Graphics-Gems-Andrew-S-Glassner/dp/01...

[5] https://www.amazon.com/Introduction-GCC-GNU-Compilers/dp/095...

As far as I know, prices of books differ between rich and developing nations. For e.g., The C Programming Language that costs $50 in the US [1], is sold for Rs. 259 (~$4 US) in India. I believe that is the case with most "economy editions" specifically targeted at developing nations. It certainly isn't an "year's wages".

While I do understand your point, it still does not justify encouraging modern-day Robinhoods' and breaking the law.

[1] https://www.amazon.com/Programming-Language-2nd-Brian-Kernig... [2] https://www.amazon.in/Programming-Language-Kernighan-Dennis-...

The C language can be best learned from "The C Programming Language, 2nd Ed" [1], also known as "K&R book". Pair it with excellent notes by Steve Summit [2], and you don't need any other book to master C.

[1] https://www.amazon.com/Programming-Language-2nd-Brian-Kernig...

[2] https://www.eskimo.com/~scs/cclass/notes/top.html

AbeBooks is a great place to buy the non-US versions of textbooks (which are almost always identical to the US version, but in grayscale rather than in color).

For instance, on Amazon, the K&R C Programming book goes for $28.52 used, $61.74 new, or $28.70 for a one semester rental [0]. For a book that hasn't changed since 1988, these prices are absurd.

While as on AbeBooks, the international edition goes for $10-11 [1].

[0]: https://www.amazon.com/Programming-Language-2nd-Brian-Kernig...

[1]: https://www.abebooks.com/servlet/SearchResults?bi=0&bx=off&c...

Indispensable:

https://www.amazon.com/Programming-Language-2nd-Brian-Kernig...