Welcome back goldwolf01,
We were happy to help provide you this additional guidance for your question. To answer your follow up question, when you drag the audio file to tracks, or to the empty area below the existing tracks, you are essentially either adding it to your existing project or adding it to a track list for later use in projects.
Check out this awesome support page for GarageBand, too: GarageBand - Official Apple Support. You'll find helpful guides and resources on using GarageBand. You can even use the Contact Apple Support link near the bottom of the support page we linked above, should you find yourself needing more immediate assistance using this app.
Take care!