Leonardo was one of the three greatest artists of High Renaissance (the other two being Michelangelo and Raphael). He developed pictural composition to achieve a more natural look as well as stability. He was an inquisitive and inventive scholar and scientist: he studied human and animal anatomy, the flight of birds, waves, motions in the air. He invented more terrible weapons, how to make a bigger bronze statue than ever before, how to span a bridge across the Bosporus....... etc, etc. All this can be found in his sketchbooks, and most of his inventions went no further. Among the sketches there are a parachute and a "helicopter". The list could be much longer, but in short he was the best representativ eof the idea of a Renaissance man, one who mastered everything.

What I remember that he was an Italian architect and painter
he had drawn Mona Lisa

Among many of his contributions, the world renowned painting of Mona Lisa is still a masterpiece...!

Mona lisa is master piece

When Leonardo DiCaprio was an embryo his mother was looking at an art work of Leonardo da Vinci. And at that time Leonardo DiCaprio kicked from inside. That is when his mother decided to name her son after the great artist.
Thus biggest contribution of Leonardo da Vinci was to give name to the Titanic star

Painter