Lifecycle 
1. Routing
Ex. "/rails_intro/hello"
class: RailsIntroController
file: app/controller/ rails.intro.controller.rb
 
Controller class
-Group: related requests
2. Action Method
Prepare data for view
Rails provides:
-prams: query values ++
   params[:x]
-params[:id]

3. View
default 
app/views/rails_intro/
hello.html.erb
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