Nextion TFT

Good afternoon, I never played with the Nextion TFT screens, I'm with a project with a 3.2 screen, but I have doubts ...

How do I send the commands to the screen and how do they return?
How can I call a page on the screen

I think all of your questions could be answered within a few hours cuddled up with the Nextion Instruction Set

Maybe a little more than a few hours....The Nextion documentation and forum is pretty cryptic. Take a look at the youtube videos and download the example library. I am in the middle of it all and am finding it quite challenging.