View

MVC can be metaphorically related to a TV. You have various channels, with different information on them supplied by your cable provider (the model). The TV screen displays these channels to you (the view). You pressing the buttons on the remote controls affects what you see and how you see it (the controller). -Tilo Mitra

Controller

We have a controller actions but wondering how to call our templates.

You have two ways to do that, there is the facade class View or you may call the function view(...)

<?php
namespace ...;

use View;

class MyController extends Controller
{
    public function index()
    {
        return view('parent_folder.child_folder.file');

        // return View::make('parent_folder.child_folder.file');
    }

    public function users()
    {
        $users = [];
        # some codes here that calls our model
        # and probably passing a data on $users array.

        return view('users.index')
            ->with('users', $users);

            # another way to do it
            // ->withUsers($users);
    }
}

The sample code above shows how to call a template or our volt template.

index() action

Instead of using slash, we're using dot to access folders. We have parent_folder.child_folder.file, it should access this volt file:
project-name/resources/view/parent_folder/child_folder/file.volt

users() action

To pass in a variable inside the volt or any template engine, we can call this chain function with('var_name', 1234), you could also try the magic method withVarName(1234) and it will be interpreted as $var_name and the value will be 1234

Module

You are wondering how could we change the views directory, we can achieve this by calling setViewsDir under our DI view

// app/modules.php
<?php

return [
    'main' => function (Phalcon\Di\FactoryDefault $di) {
        $di->get('view')->setViewsDir('/going/to/my/separated/folder');
    },
];

Learn More

To learn more about the whole view process, you may click these references: