Programming
All things programming and coding related. Subcommunity of Technology.
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https://jsommers.github.io/cbook/cbook.pdf
Might be a good way for someone who is familiar with a higher level language.
Than there is of course "The C Programming Language" by Ritchie and Kernighan and "advanced programming in the unix enviroment" by stevens and rago.
So, i'd guess just get your feet wet with small stuff. Find out how to take arguments from the command line, or read a file, maybe programm a simple guess the number game. After you are more familiar with the syntax and so on you could look into using your c code in a higher level language. For python you'd have to look into ctypes for that.