Read K&R. Yes, it's explicitly not modern C, but it enables you to think about C from a foundational level from which you can then go on to learn modern C. Build a project in C to learn how and why it works, and you'll understand how memory safe languages like Rust came about. This is what we did in college, started with C then moved on to Rust, it worked well.
What book would you suggest to someone who started with the K&R 2nd ed, then did other things, and now wants to catch up on the more modern C standards, at least the more widely supported ones?
