Drupal Menu

This is important case. When you write a drupal hook of menu, plase keep in mind for include your package to the first segment of uri.

package = learning

module = lola

function lola_menu(){

    $items = array();

    $items['learning/lola'] = array(

        'title' => 'Lola Main Menu',

        'page callback' => 'hello',
        'access callback' => TRUE,

    )

    return $items;

}

function hello(){
    // echo 'Hello For You All';
    // if you want the echo of text written as a part of page,
    // use below
    return t('Hello For You All');
}

Drupal Menu