Linux (OS in general) and C++ (Prog Lang in general)

How programming language uses OS to achieve solution or software goals? I am not talking about g++ compiling directive or things like that, but how OS is used in source code and how OS uses source codes
Please answer if you can with example...I ask this because I wish to decide on the courses I take in Electives
> decide on the courses I take in Electives
Talk to the responsible of the course an ask how it will apply/relate with your main course/interests.
Read the syllabus.
Oh! they are so busy and their answer is very professional, but not much details :(
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