Simple PyQt6 Application

1. First, you'll need to install PyQt. You can do this by running the following command in your terminal:
   pip install PyQt5
2. Next, you'll need to import the necessary modules from PyQt. In this example, we'll be using the QApplication and QPushButton classes. You can import these by adding the following lines to the top of your Python file:

   from PyQt5.QtWidgets import QApplication, QPushButton

3. Now, you can create an instance of the QApplication class. This class manages the main event loop, where all events from the window system and other sources are processed. Add the following code to create an instance of QApplication:

   app = QApplication([])

4. Next, you can create an instance of the QPushButton class. This class provides a simple button widget. Add the following code to create a button:

   button = QPushButton("Click me!")

5. You can then set the text of the button using the setText() method and the button's position on the window using the move() method. For example:

   button.setText("Hello World!")
   
   button.move(100,50)

6. Lastly, you'll want to make the button visible on the screen. You can do this by calling the show() method on the button.

   button.show()

7. Finally, you need to run the application by calling app.exec_() to start the event loop, this will make the button visible on the screen and allow the user to interact with it.

   app.exec_()

Your complete code should look like this:

from PyQt6.QtWidgets import QApplication, QPushButton

app = QApplication([])

button = QPushButton("Click me!")

button.setText("Hello World!")

button.move(100,50)

button.show()

app.exec_()

Run the code above, you will see a window with "Hello World!" button on it. If you have any question, feel free to ask.