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I followed this http://www.osdever.net/bkerndev/Docs/intro.htm with some pointers from osdev wiki

Nice! I remember following this site back in the day. My tiny "OS" got till paged memory management and didn't really go any further. I used to use "Bochs" CPU emulator for testing.

Right, I used bochs too: it was a full emulator, none of this "let's just let the CPU really run these" things. :)

In Rust rather than C, but a good walk through the basics of getting an OS booted:

https://os.phil-opp.com/

https://wiki.osdev.org

In addition to the resources other have mentioned, I've found this http://pages.cs.wisc.edu/~remzi/OSTEP/ valuable.