Every language employs the C programming language to varying degrees.
Learn C++
BottomUp Computer Science
How to C in 2016
Dive into Systems
Beej’s guide to C
C Programming
SEI CERT Coding Standards
C++ reference
Think in C++ 2nd
MIT C memory management
Standard library reference
Structures in C
C strings
C tips
A RegEx by Rob Pike
C++ core guidelines
STL summary
Ninja
Meson
Bazel
CMake
Moder CPP stack
Makefile tutorial
Short introduction
Automatic variables
Text functions
Special targets
Build your own from scratch
Crafting interpreters
Game programming patterns