[Rails] form_for arguments

At the following: http://edgeguides.rubyonrails.org/getting_started.html

Under: 7.4 Generating a Controller

It mentions the following:

<%= form_for([@post, @post.comments.build]) do |f| %>

Why should we insert TWO arguments?

Doesn't @post.comments.build do the idea? Since I need a form for the
comments belonging to @post?

What is the use of the FIRST @post?

It seems that we are passing an array here?

Thanks.
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