Let me save you a huge headache — don’t set an EFI password on your Mac unless you have the original receipt for that machine.
If you buy your Mac off Craigslist, like I did, and your daughter writes half a novel for her high school class but never backs it up elsewhere (note – always back up your stuff!), and then her MacBook Air suddenly won’t boot up, the EFI password the previous owner put on the laptop will prevent you or Apple from accessing the hard drive or ever using the computer again.
Hypothetically, of course.
If you don’t want to have to tell your daughter she loses her computer and will need to wait a week while you find a way to connect her SSD to another Mac and find her files, disable that EFI password now.