On: Beej’s Guide to C Programming [pdf]

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Pointers seem easy until you understand the pointers you're working with do not correspond with the basic hardware model you have in mind:

https://www.ralfj.de/blog/2018/07/24/pointers-and-bytes.html

https://www.ralfj.de/blog/2020/12/14/provenance.html

https://www.ralfj.de/blog/2019/07/14/uninit.html