I had learn a lot from those.
What every programmer should know about memory, Part 1
(the rest of the parts are linked at the end of the article, just before the comments)
What Every Computer Scientist Should Know About Floating-Point Arithmetic
https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html
A bit more security related… but not much 
https://www.win.tue.nl/~aeb/linux/hh/thompson/trust.html
A bit of history
https://www.bell-labs.com/usr/dmr/www/chist.html
Well actually there is a lot of interesting reading in Mr Ritchie page
https://www.bell-labs.com/usr/dmr/www/index.html