JennyOndioline

This question is actually super relevant because if you're on a mac there's a good chance you have GarageBand built onto your HDD. It's not very powerful but it's a decent beginner's tool.

Otherwise I'm going to jump on the Ableton train. You can learn the basics of it in an afternoon. It looks more intimidating than it is, and unlike other DAWs, the more you master it, the more there is to discover. Before you know it, you'll be learning how to use even more powerful software.

Also, Ableton has a ton of extremely simple built-in tutorials. I'd recommend those over any youtube video if you're just starting out.