Start with a Container node to house our information

In the BaseLevel scene

Add a MarginContainer node as a child

Rename it to Bank

This will represent the money the player has

to spend on turrets and upgrades

At the top of the Viewport

Next to the View button

Click on the Anchor Presets button

Choose Full Rect

Click on the Margin Container

In the Inspector:

Expand the Theme Overrides property

Expand the Constants property

Set a 16px margin on all side

The MarginContainer will be

in front of everything in our scene

to prevent it from interrupting mouse clicks

which could disrupt turret placement

In the Mouse property

Set Filter mode to ignore

Add a Label as a child of MarginContainer

Add an export variable for starting gold

Add an onready variable to access the label

Create a set variable for the gold

Set gold to the parameter gold_in

Choose the biggest number between

gold_in and 0 and set that to gold

(This ensure gold cannot be negative)

Update the label to display current gold

In the ready function set gold to starting gold