It's great for what it is, but the language and style have come a long way since then. It would be better to learn "Modern C" (this is the title of a book but also at least learn C99 not K&R C).

E.g., people like the book by Jens Gustedt. I'm ambivalent about it, but it sure machine-guns the important points.

[1] https://hal.inria.fr/hal-02383654/file/ModernC.pdf