Godot fixes
One broken thing per page. The answer is at the top. The causes are in the order they are usually the answer, and each page ends with how to confirm it is really your bug.
These are the ones that come up again and again while teaching. Both are silent failures: nothing errors, nothing warns, and the scene looks right.
area_entered or body_entered does nothing
My Area2D signal never fires in Godot 4
Five things stop it, and the first two account for most of them: the layers and masks do not point at each other, or the detector is not monitoring.
Godot 4.7
one touch drains the whole health bar
My hitbox damages the player every frame
Overlap is true on every frame, so anything that reads it in _physics_process fires sixty times a second. Damage on the signal, then lock it out with invincibility frames.
Godot 4.7
Stuck on something that is not here?
The quests cover these systems properly, and you write the code rather than reading it. The 2D roguelike course is free, all eight lessons, no card.