Create sound

Help me out guys i want to have sound in my game
how do i create a sound clip to move into my game.
i made some on garageband but they don’t work in
the game so I’m look for another way to make a sound
clip that work in my game.

First, you need to export it to a .mp3 file, or whatever GarageBand can export to. Then, you use an AudioSource to play the sound that you exported. I assume you know how to do this, and that you saved the file instead of exporting it. If the files that were exported still do not work, I would recommend using Audacity, as DaveA said.