Looking at your scene tree, the get_node() should work. Although I would caution against using such code in that way.
Let’s call the scene with the world, camera scene, and player scene etc. the “main” scene.
I suspect this should run fine in the main scene, but if you run the camera scene by itself get_node will fail and return null.
They tutorial does this another way.
You need to export a variable target node
@export var targetNode:Node2D = null
Then in the inspector pane select the player node from the list.
