Making things that damage the player

[EyadMahm0ud]

Add Trigger Once with collision conditions.
for further information:

How exactly does "Trigger once while true" work?

Howdy! I was toying around, making a puzzle platformer game, when I decided to try adding weapons. The code was simple: Trigger once while true Left mouse button is pressed down: Spawn bullet at position “player” The code seemed fine, but as I tested it, it just didn’t work. I was racking my brain for some 15 minutes when by sheer accident I flipped the two conditions so it said: Left mouse button is pressed down Trigger once while true: Spawn bullet at position “player” And suddenly, it …

https://wiki.gdevelop.io/gdevelop5/all-features/advanced-conditions/