What really happened to Malaysia Airlines Flight 370 in 2014?

It's been 10 years and it is still the biggest mystery of the whole aviation world. What are your theories? :coffee::coffee::coffee:
I find it bewildering to think that even after ten years the mystery surrounding some of the most basic principles of flight remains unsolved. In all, it may be ranging from a mere technical defect to an art of cover up, I am not very sure. Again, it can be compared to such things as the Bermuda Triangle—sometimes it exists, and then, in a few moments, it is gone. Sometimes it makes me even lose my sleep, man. ✈🤔