Hi, thanks for asking! So for making the beats I usually use the default instruments in garageband. I also used the drum samples linked in this video:
I use the izotope vinyl plugin on some of the electric piano + guitar sounds to give it a lo-fi feel. I once wrote a long reply on how I think people can get started making lo-fi beats in general. If you're interested you can read that here! I think I'll expand on that and turn it into a longer devlog at some point.