Ruby on Rails

Hi,
I'm an amateur learning rails and could use some help…
I created a join table "pictures_questions"
and append to it in the following way:
@picture = Picture.new(params[:picture])
…
if @picture.save
@question.pictures << @picture

Everything works fine but honestly I think I got this working by sheer
luck and trial and error. I have 2 questions:
1. I do not understand the difference between naming the join table
pictures_questions vs questions_pictures (ie how to decide which to use)
2. I do not understand the ".pictures" in @question.pictures - is it
an attribute of @question because of the join table?

Thanks

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