How to check current laravel version install your system?

Where do we need to set database connection in Laravel?

In Laravel Interpolation done by using below which symbol/ file?

What would this touch() function do?
 

$obj= User::find(1);
$obj->touch();

After running "artisan down", The project will show the maintenance page. What would be HTTP Status return Code?

Which directory contain “robot.txt” file ? 

What is the minimum PHP version required to install Laravel 5.3?

$user = DB::table('users')->SomeName()->first();
For getting newest registered user, In above function
What would be the below options replace by SomeName.

Which functions are used for database migration classes?

How to set a session data in Laravel?

Which directory not in side the app directory?