If 1.4 billion people on the planet speak Mandarin, how difficult can this language be?

Documenting our little steps in big China. Stories from a mother of two boys from two very small nations 🇨ðŸ‡ðŸ‡¸ðŸ‡¬
If 1.4 billion people on the planet speak Mandarin, how difficult can this language be?