This list is taken from YouTube channel: The Cherno

Compiler: g++ (gcc version: 9.2.1 20200306)
OS: Linux 5.4.0-4-amd64
CXX Flags: -Wall -std=c++11 -g

Editor: VS Code (x64)
clang-format: Microsoft

1. Pointers [X]
2. References [X]
3. Classes [X]
4. Classes vs Structs [X]
5. Extern [X]
6. Static for Classes and Structs [X]
7. Local Static [X]
8. Enums [X]
9. Constructors [X]
10. Destructors [X]
11. Inheritance [X]
12. Virtual functions (overrided function) [X]
13. Interfaces (pure virtual functions) [X]
14. Visibility [X]
15. Array [X]
16. Strings [X]
17. String Literal [X]
18. Const and Mutable [X]
19. Member Initializer [X]
20. Ternary [X]
21. Create and Instantiate an Object [X]
22. Auto keyword [X]
23. Lambda [ ]
24. Implicit and explicit conversion [ ]
25. Operators overloading [ ]
26. This keyword (pointer) [ ]