Updating table scheme without affecting data in Laravel

Question

I am new to Laravel from code igniter and I am LOVING THE FRAMEWORK! My life is so much easier now.

I have created a table with columns using php artisan and entered som

Answer 1

create new migration with artisan name it addColumnFestivalTable

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;

class addColumnFestivalTable extends Migration {

public function up()
{
    Schema::table('festivals', function($table)
    {
        $table->string('new_col_name');
     });

}

public function down()
{
    Schema::table('festivals', function($table)
    {
       $table->dropColumn('new_col_name');
    });
}

}

for more information read Laravel 5.4 doc