Does guest information stay saved? If I am using a friends computer as a GUEST and then sign out. Can my information still be seen by the owner of the computer or does it get deleted???
Like I did t want them to see what I was researching ect ??
No, guest data is not permanent.

From Apple docs


  Files created by a guest are stored in a temporary folder, but this folder and its contents are deleted when the guest logs out.