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Pygame - Max OS X screen resolution and moving an image

Hello
I am trying to follow the Pygame course, and I stumbled upon an issue with the screen resolution.
On lesson 1, we set up the screen resolution to width 800, height 600
on lesson 3, we are going to move the racing car  with:
x =  (display_width * 0.45)
y = (display_height * 0.8)

I have an issue with that, I had to reset the x, and y to fit the car on the surface, yet the left right arrow moves the window not to car because I think that the surface is not correctly setup ... can you please help ...

Below is my code

import pygame

pygame.init()

#define screen resolution
display_width = 800
display_height = 600

#define colors - RGB
black = (0,0,0)
white = (255,255,255)
red = (255,0,0)



#setup a window also called surface or frame and its resolution
gameDisplay = pygame.display.set_mode((display_width,display_height)) #screen resolution
pygame.display.set_caption('A bit Racey')

clock = pygame.time.Clock() #specific game clock

#load image
carImg = pygame.image.load('racecar.png')
#display the image

def car(x,y):
    gameDisplay.blit(carImg,(x,y)) #blit = copy to

x = (display_width*0.00000000000000001)
y = (display_height*0.00000000000000001)
x_change = 0
y_change = 0

#game loop - logic for your game
crashed = False

while not crashed:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            crashed = True

        if event.type == pygame.KEYDOWN: #key pressed
            if event.key == pygame.K_LEFT:
                x_change = -5
            elif event.key == pygame.K_RIGHT:
                x_change = 5

        if event.type == pygame.KEYUP:  #key released
            if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                x_change = 0
                
    x += x_change
    
    gameDisplay.fill(white)
    car(x,y)

    pygame.display.update() # update the entire window

    clock.tick(60)  # frame per seconds

pygame.quit()
quit()