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Suggestions for getting better with C
(programming.dev)
Welcome to the C community!
C is quirky, flawed, and an enormous success.
... When I read commentary about suggestions for where C should go, I often think back and give thanks that it wasn't developed under the advice of a worldwide crowd.
... The only way to learn a new programming language is by writing programs in it.
🌐 https://en.cppreference.com/w/c
Complete all the CodeStepByStep problems: https://www.codestepbystep.com/problem/list/c
Read a Data Structures and Algorithms book.
If you've done university Calculus then read Sedgewick: https://www.amazon.com/Algorithms-Parts-1-5-Bundle-Fundamentals/dp/0201756080/
If you haven't then read Loudon: https://www.amazon.com/Mastering-Algorithms-C-Kyle-Loudon/dp/1565924533
Write a basic game, like a text strategy game in ncurses or a roguelike. Add ability to save and load games, design it so the computer can play the game itself and the player can drop in or out at any time.
Read good code like musl libc. Redis and modern BSD are also said to be good.