Does a factory reset truly erase everything?

[linedog]

So my non Mac wife thought she would give the new MacBook a try, well she hates it. She's sending it back and wants to make sure everything is off of it. Will a factory reset truly erase everything?

 

[ferrarr]

See this, https://support.apple.com/en-us/HT201065

 

[linedog]

Thanks, I forwarded her the link. She's on her own as I wave bye bye to a new MacBook.