You can write your topic however you want, but you need to answer these questions:
I’m trying to make a simple combat system and I’m having issues with trying to implement it please help me.
if you’re using tools you should just be writing the code in a regular script, not a local script.
if your tool requires client specific features such as UserInputService, use Remote Events and/or Remote Functions.
Remember, the client cannot be trusted. Calculate damage on the server, not client, and verify if things should be possible (is the player close enough to the target in order to hit them, etc)