Open the config/routes.rb file and add a new route to it.

Rails.application.routes.draw do
  resources :habits, only: [:show]
end

This route instructs Rails to call the show action method on the HabitsController class, when a user visits the path /habits/1. You can also access this route programmatically using the URL helper named habit_path, passing an instance of Habit model.

If you want to learn routing in detail, check out the following article: Understanding the Rails Router: Why, What, and How

Now that we have a valid route to show the habit, we need a controller and action to handle the incoming request.