In which fields of C++ do you have stable understanding and experience?

I have a solid understanding and experience in using C++ in the following areas:

• Development of system and application software, where high performance and resource control are important.

• Working with low-level APIs and drivers, requiring direct interaction with hardware.

• Creating cross-platform libraries and components, utilizing templates and object-oriented programming.

• Optimizing algorithms and data structures for increased efficiency.

• Using modern C++ standards (C++11 and above) to improve code readability and safety.

Example of a simple class using templates:

template<typename T>
class Stack {
    std::vector<T> elems;
public:
    void push(const T& elem) { elems.push_back(elem); }
    void pop() { elems.pop_back(); }
    T top() const { return elems.back(); }
};