Confusion about "fill out" and "fill in"
How do you use "fill in" and "fill out" relating to putting information in a form?
As far as I understand, I would use "fill in" when I put neccessary piece of information in one blank space or some certain blank spaces, not the whole space in a form. And I would you "fill out" when I put information in all blank spaces in a form ( when I complete a form)
What do you think?