Preparing for collisions
The player should detect when it hits a coin or an obstacle, but you haven't made them do so yet. That's OK, because you can use Godot's signal functionality to make it work. Signals are a way for nodes to send out messages that other nodes can detect and react to. Many nodes have built-in signals to alert you when a body collides, for example, or when a button is pressed. You can also define custom signals for your own purposes.
Signals are used by connecting them to the node(s) that you want to listen and respond to. This connection can be made in the Inspector or in the code. Later in the project, you'll learn how to connect signals in both ways.
Add the following to the top of the script (after extends Area2D ...
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