$(document).ready(function() {
  // Example 1: Select by Element Tag
  var h1Element = $('h1');
  h1Element.text('Hello, jQuery!');

  // Example 2: Select by Class
  var paragraph = $('.paragraph');
  paragraph.text('This is an updated paragraph.');

  // Example 3: Select by ID
  var listItem2 = $('#item2');
  listItem2.text('Modified Item 2');

  // Example 4: Select by Attribute
  var listItems = $('li[data-index="1"]');
  listItems.css('color', 'blue');

  // Example 5: Select by Multiple Selectors
  $('h1, p, li').css('font-weight', 'bold');

  // Example 6: Select by Descendants
  var allListItems = $('ul li');
  allListItems.css('background-color', 'lightgray');

  // Example 7: Select by First and Last
  $('li:first').css('color', 'red');
  $('li:last').css('color', 'green');

  // Example 8: Select by Even and Odd Index
  $('li:even').css('background-color', 'yellow');
  $('li:odd').css('background-color', 'orange');

  // Example 9: Select by Child
  $('ul > li').css('border', '1px solid black');

In this example, we have different ways of selecting elements using various selectors:

Select by Element Tag: $('h1')
Select by Class: $('.paragraph')
Select by ID: $('#item2')
Select by Attribute: $('li[data-index="1"]')
Select by Multiple Selectors: $('h1, p, li')
Select by Descendants: $('ul li')
Select by First and Last: $('li:first') and $('li:last')
Select by Even and Odd Index: $('li:even') and $('li:odd')
Select by Child: $('ul > li')