C or Cpp In Ethical Hacking/Cyber-Security

Since a month I am hearing that C is required for Memory Management. Also, Linux and many operating system are written In C.

But, I am still In a doubt.. If C++ as an extension of C then It's Obvious C++ Inheritis all the properties of C. Then learning C++ Is like Learning C side by side. Why Not people Encourage this approach? Any Reason?

And, Does C permits the developer to access Unpermitted Files than of Python?

From 1 June — 30 June, I aimed to Learn C, since I know the basics of C++ as well as I already Learn Python So applying logic to Experiment Output would be fast, Right?

Last, I am Truly Aiming to learn C at least for my Career Beginning In Linux. Is There any Vast Use of C or just Memory Handling?

https://redd.it/1tr3sjv
@r_cpp