Have you tried looking through the help channels? I'm pretty sure this has been answered.
#how do I make a gun deal damage
safe inlet
Ok so you'll want to search, either in this specific channel, or search the entire discord, for "deal damage". You'll be given a lot of results, I'm sure that you'll find something useful.
This is just one of the posts I found:
https://discord.com/channels/193073071802941451/1041769781033967758
slim nebula
It’s on YouTube, search projectile launcher not doing damage and you should find it