Say that your game world is stored in an a 2d-array, telling you what each tile contains. So if you have variables for the player's X and Y coordinate, and you want the view area to extend 5 tiles away from the player, then make a nested for-loop (one of the X, one for the Y) that goes from the player's position minus 5 to the player's position plus 5, being careful to check that you're not going outside the bounds of the array. Then simply draw those tiles onto the screen.
Help with viewports
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