In this part of your game code, we're focusing on displaying the player's score and the player character itself, then updating the game screen to show these changes. Here’s a simplified breakdown:

Displaying the Score

main_display.blit(FONT.render(str(score), True, COLOR_WHITE), (WIDTH-50, 20)): This line takes the player's current score, converts it to a string (so it can be displayed as text), and renders it using a predefined font (FONT). The text is displayed in white (COLOR_WHITE) at a position near the top right corner of the game window (calculated by WIDTH-50, 20). This keeps the score visible to the player during the game.

Displaying the Player Character

main_display.blit(player, player_rect): Here, we're drawing the player's character (player) on the screen at the position defined by player_rect. This ensures that the player sees their character and can control it during the game.

Updating the Display

pygame.display.flip(): Finally, this command updates the entire screen with everything we've drawn so far. It essentially "flips" the display to show the new state with the updated score and player position. This happens each loop cycle, keeping the game visuals current.

Together, these steps ensure that the player always knows their score and can see their character moving around the screen, making the game interactive and engaging.