How to set hreflang manually in website?

Here we are simple way to add 'hreflang' manually. We just have to add code in "html.html.twig" file.
For Front page code:

{% if is_front %}
<link rel="alternate" href="https://www.google.com/" hreflang="x-default" />
<link rel="alternate" href="https://de.google.com/" hreflang="de-de" />
<link rel="alternate" href="https://www.google.com.cn/" hreflang="zh-cn" />
<link rel="alternate" href="https://fr.google.com/" hreflang="fr-fr" />
{% endif %}

For Full website code: Without add any "if" condition.

<link rel="alternate" href="https://www.google.com/" hreflang="x-default" />
<link rel="alternate" href="https://de.google.com/" hreflang="de-de" />
<link rel="alternate" href="https://www.google.com.cn/" hreflang="zh-cn" />
<link rel="alternate" href="https://fr.google.com/" hreflang="fr-fr" />

<meta name="title" content="News Releases" />
<meta name="description" content="demo description." />
<meta name="keywords" content="demo, description" />



Note: If have any suggestions or issue regarding 'How to set hreflang manually in website?' then you can ask by comments.

How to display records in custom module with pagination?

It is simple to display record/data from database in drupal 8 with pagination, here we are going to explain by example with some simple steps:
Step 1:
Create a folder with name of "gpcustom", this is our custom module name. Now create a file "gpcustom.info.yml" for create identity of module.
and the code for this file is..

name: Student Records
description: 'Display student records'
type: module
core: 8.x

Step 2:
Create a file with name of "gpcustom.routing.yml", here we are going to declare routing means path for display record page.
and the code for this file is..

google_feeds_list:
  path: 'student/record'
  defaults:
    _controller: '\Drupal\gpcustom\Controller\gpcustomController::student_record'
    _title: 'Student Records'
  requirements:
    _permission: 'access content'   
   
// _controller: '\Drupal\gpcustom\Controller\gpcustomController::student_record'  means '\Drupal\gpcustom\Controller\viewController' is file path for function and 'student_record' is the function name.   
// _permission: 'access content' means anybody can access this page without login.
// path: 'student/record' means display record page url.
// _title: 'Student Records' means title of page.

Step 3:
Create a folder with this hierarchy '\src\Controller\' and file with name of "gpcustomController.php".
and the code for this file is..
<?php
namespace Drupal\gpcustom\Controller;
use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\Database\Database;
use Drupal\Core\Url;

/**
 * Class DisplayTableController.
 *
 * @package Drupal\gpcustom\Controller
 */
class gpcustomController extends ControllerBase {

  /**
   * Returns a render-able array for a test page.
   */
  public function student_record() {
    //create table header
         $header = array(
         'id'=> t('SrNo'),
         'name' => t('Candidate Name'),
         'mobile' => t('Mobile Number'),
         'email' => t('Email ID'),
         'age' => t('Age'),
         'gender' => t('Gender'),
         'opt' => t('operations'),
         );

    //select records from table
    $query = \Drupal::database()->select('mydata', 'm');
    $query->fields('m', ['id','name','mobilenumber','email','age','gender']);
    $pager = $query->extend('Drupal\Core\Database\Query\PagerSelectExtender')->limit(3);
      // The actual action of sorting the rows is here.
    $table_sort = $query->extend('Drupal\Core\Database\Query\TableSortExtender')
            ->orderByHeader($header);
    $result = $pager->execute();
    $rows=array();
    foreach($result as $data){
        if ($data->id != 0 && $data->id != 1) {
   
        $operate = '<a href="/drupaladvance/mydata/form/mydata?num='.$data->id.'">Edit</a>|<a href="/drupaladvance/mydata/form/delete/'.$data->id.'">delete</a>';
        //print the data from table
         $rows[$data->id] = array(
             'id' =>$data->id,
             'name' => $data->name,
             'mobile' => $data->mobilenumber,
             'email' => $data->email,
             'age' => $data->age,
             'gender' => $data->gender,
             'operation' => t($operate),
           
         );
        }
    }
        //display data in site
         $form['table'] = [
         '#type' => 'table',
         '#header' => $header,
     '#rows' => $rows,
     '#empty' => t('No users found'),
     ];
      // Finally add the pager.
        $form['pager'] = array(
          '#type' => 'pager'
      );
     return $form;

    }
}
?>
So that's all for display data by csutom module in drupal 8, now clear the cache and goto the modules page '/admin/modules' and find by name your module and enable it.
and go to the URL which we decide in '.routing.yml' file.

Note: If have any suggestions or issue regarding 'How to display records in custom module with pagination?' then you can ask by comments.