form_for can someone please explain this?

I have been trying to understand how form_for works and the api or
anything on the web does not offer a simple explanation that i could
understand. seems all their explanations are too complicated for me.

What is it that you do not understand? If you cannot work out how to
use it at all then have a look at the rails guide Getting Started at
guides.rubyonrails.org. This includes the use of form_for to get you
started.

Colin