This looks awesome, I haven't had the need to become more proficient at C since having learned (the basics of ) it as my first language, but this gives me some

This looks awesome, I haven't had the need to become more proficient at C since having learned (the basics of ) it as my first language, but this gives me some motivation to learn more about it. I also really like that the book can be read by people of varying levels of experience, with sections devoted to different groups.