Connect signals to callbacks through the editor interface

In Godot you can use the Signals tab next to the Inspector tab for connecting to signals. Instead of connecting through the script like: hit_box.body_entered.connect(_on_body_entered). When connecting through the editor interface you can select the node who's script the callback will be added. Plus there are a number of tricks:

• Add extra call arguments. For example, the same _on_button_pressed() callback can be used by multiple buttons, each passing a different value to an extra argument.
• Unbind (drop) signal arguments if you don't need them.
• Tick options like Deferred, One Shot.

See the Godot Documentation for a step-by-step tutorial.