tap/app/controllers/users_controller.rb

class UsersController < ApplicationController
  def new
  	@user = User.new
  end

  def show
  	@user = User.find(params[:id])
  end

  def create
  	@user = User.new(user_params)
  	
  	if @user.save
  		redirect_to @user
  	else
  		render 'new'
  	end
  end

  private

    def user_params
      params.require(:user).permit(:name, :marks)
    end

end