Ruby Onrails Router Question.

I'm studying Ruby On Rails. I'm asking a question because I have a question while reading the book and copying the example. It is said that if you register resource :name with the router now, you can use the defined method, but I am not sure how it works.

The controller code is as follows. Click the button to insert 1 to 10 into the Post Division. And that's how the index shows it.

class HomeController < ApplicationController


  def index 
    @posts =Post.all



  end 


  def write
        1.upto(10) do |s|
      local = "/home/ubuntu/workspace/app/views/home/#{s}.html.erb"
      if not File.exists?(local)
      postDB = Post.new
      postDB.title = s
      puts s
      postDB.save   

      aFile = File.new( local, 'w')
      if aFile
        puts aFile.syswrite("<h1>")
        puts aFile.syswrite(s)  
        puts aFile.syswrite("</h1>")

        aFile.close
      end
      else
        puts 'Unable open file'
      end#else



     end # 1 to 10 
     redirect_to "/home/index"

  end
end # end class

When the code is executed, data from 1 to 10 is accumulated in the DB, and html files are also generated as shown below.

router.rb

Rails.application.routes.drawdo
  get 'home/index'
  post 'home/write'

  get 'post/:2' => 'home#art#2'
  get 'post/:3' => 'home#3'
  resources :post

  # # The priority is based upon order of creation: first created -> highest priority.
  # # See how all your routes lay out with "rake routes".

  # # You can have the root of your site routed with "root"
   root 'home#index'

end

The bottom is the screen that you can see it. If you press the 3rd show here, it shows the 3.html screen as I want. I registered with the router.

However, if you press another show that you have not registered (excluding number 3), the following error message appears.

I have two questions here. First, resource:post to the router In other words, I wonder how to use the benefits of registering a post database. For example, in order to show you the HTml from 1 to 10, get 'post/:1' => 'home#1' get 'post/:2' => 'home#2' Should I set it up to 10 like this?

And when I create a random file called home/art, how can I show the router settings for the 2.html.erb in this file?