Now that your USB drive contains the bootable Batocera OS, it is time to boot it.
You cannot simply copy/paste the ISO file to a USB drive. You must use imaging software that writes the boot sector and partition table.
First, a quick cleanup of terminology.
Batocera treats them mostly the same, but storage is your first boss battle.
This is the most common version for desktop PCs, laptops, and Intel NUCs.