[Tutorial] Potentially confusing explanation of how a component rendering is triggered

I'm new to React and when learning, I first went through the tutorial and then went through the docs. In the tutorial I didn't quite understand why we absolutely have to use the setState() method. But when going through the Using State Correctly and then the API docs for setState() I understood why. Then I went back to the tutorial to see why I couldn't get this from the tutorial. State is introduced in the Making an Interactive Component section.

I think it'd be better if it's explicitly mentioned here that state changes are what causes components to be re-rendered and hence, one shouldn't attempt to modify state directly. The following part particularly is what gave the wrong impression I think. I took this to mean that it's events such as onClick that triggers a rendering.

By calling this.setState from an onClick handler in the Square’s render method, we tell React to re-render that Square whenever its <button> is clicked.

Rivedi la sezione „Making an Interactive Component“ del tutorial insieme alla documentazione collegata „Using State Correctly“ e „setState() API“. Concentrati sulla spiegazione citata e verifica che il testo rivisto distingua chiaramente gli eventi di clic dai cambiamenti di stato. Il lavoro è completato quando un nuovo arrivato comprende perché setState() attiva il rendering e perché lo stato non deve essere modificato direttamente.