What you need to just click on yellow symbol on top the screen which indicates the "View Controller"

Hold down the control key and drag aero to the SecondViewController and chose type of segue. Now this segue links ViewController to SecondViewController

Now your question might be "how do I trigger it when I press the button ? "

In order to use this segue you will need to give it a identifier, go to atribute inspector and keep segue selected and give a name to it. I have given goToSecondScreen.

Now we need to link the button via IBAction, we can call it buttonPressed.

Now all we have to say that

  performSegue(withIdentifie: "goToSecondScreen", sender : self)

Lets consider what user does on first screen will determine the what will apear on second screen.

Lets take TextField on first screen ViewController and Label on second screen SecondViewController. We are going to ask user to enter some data on first screen and we will pass it to the second screen to display as result.

I have connected TextField to ViewController and named it textField and Label to SecondViewController and named it label.

Now override a method prepare for segue as below

  override prepare (for segue: UIStoryboardSegue, sender: Any?){
      if segue.indentifier == "goToSecondScreen" {
  
      }
  }

Now lets create a prperty in SecondViewController called textPassedOver.

      var textPassedOver : String?

Now we have to grab the reference of SecondViewController and assign value to it from textField

      let destinationVC - segue.destination as! SecondViewController
      destinationVC.textPassedOver textField.text

Now lets set textPassedOver value to label in SecondViewController.

And its working.