K&R still the best book on C. The language hasn't changed all that much over the years. The C Programming Language (Second Edition) by Kernighan & Ritchie. Ava

K&R still the best book on C. The language hasn't changed all that much over the years. The C Programming Language (Second Edition) by Kernighan & Ritchie. Available online for free: https://ia903407.us.archive.org/35/items/the-ansi-c-programming-language-by-brian-w.-kernighan-dennis-m.-ritchie.org/The%20ANSI%20C%20Programming%20Language%20by%20Brian%20W.%20Kernighan%2C%20Dennis%20M.%20Ritchie.pdf https://ia903407.us.archive.org/35/items/the-ansi-c-programm... You can find other C books and online resources to get up to speed on "modern" C features (C99), but 95% of K&R still applies.