sudo command in Linux

superuser do

cc command in Linux to compile c programs

https://www.geeksforgeeks.org/cc-command-in-linux-with-examples/

bc command in Linux for arithmetics

https://www.geeksforgeeks.org/bc-command-linux-examples/

Dialectic Deduction and Reasoning: Aristotle

https://simplyphilosophy.org/study/aristotles-kinds-deduction/

LISP Programming language : Functional Programming

https://www.tutorialspoint.com/lisp/index.htm

Friend functions and classes in C++

https://www.geeksforgeeks.org/friend-class-function-cpp/

Data Abstraction

What is data abstraction and how to implement it in your code.