Because there are over 200 cores available, it is best to prioritize the ones you need. Below is a quick reference for recommended cores for popular systems:
Select your content directory and choose the specific system platform. Set the target core you wish to use for this playlist. if your ROMs are zipped. RetroArch 9000 ROMs
Inside your ROMs folder, create system-specific folders: Because there are over 200 cores available, it
Start small. Scan your NES folder first. Then add SNES. Then arcade. Before you know it, you will be staring at a playlist of 9,000 games—and the hardest choice will be choosing which one to play first. RetroArch 9000 ROMs