Princeton's CS50 course on edx.org covers C and recommends other good books like Hacker's Delight. This is also a good presentation for safer C programs https:

Princeton's CS50 course on edx.org covers C and recommends other good books like Hacker's Delight. This is also a good presentation for safer C programs https://www.bsdcan.org/2010/schedule/events/172.en.html https://www.bsdcan.org/2010/schedule/events/172.en.html