PROPER EVENT BINDING: Consider using the preferred .on() method rather than .click(), .bind(), .hover(), etc.

I have a question about proper event binding. How to implemet on my js?

/*================= Custom js file =================*/

/*************************************************
  1. Start of use strict
  2. Smooth Scroll
  3. Slick Slider  
      1. Logo Slider
      2. Testimonial slider
      3. Portfolio Slider
  4. MagnificPopup
  5. Shrink Header
  6. Auto close navbar-collapse on click a
  7. ctivate scrollspy to add active class to navbar items on scroll
  8. Jarallax
*************************************************/

// Start of use strict
"use strict";

/*------------------------------------------------
* Smooth Scroll
------------------------------------------------*/
$(window).on('load', function() {
  jQuery('a[href*="#"]')
  // Remove links that don't actually link to anything
  .not('[href="#"]')
  .not('[href="#0"]')
  .not('[data-toggle="tab"]')
  .click(function(event) {
      // On-page links
      if (
          location.pathname.replace(/^\//, '') == this.pathname.replace(/^\//, '') &&
          location.hostname == this.hostname
      ) {
          // Figure out element to scroll to
          var target = jQuery(this.hash);
          target = target.length ? target : jQuery('[name=' + this.hash.slice(1) + ']');

          // Does a scroll target exist?
          if (target.length) {
              // Only prevent default if animation is actually gonna happen
              event.preventDefault();
              jQuery('html, body').animate({scrollTop: target.offset().top - 75
              }, 1000, function() {
                  // Callback after animation
                  // Must change focus!

                  var $target = jQuery(target);
                  $target.focus();
                  if ($target.is(":focus")) { // Checking if the target was focused
                      return false;
                  } else {
                      $target.attr('tabindex', '-1'); // Adding tabindex for elements not focusable
                      $target.focus(); // Set focus again
                  };
              }) ;
          }
      }
  });
});

/*------------------------------------------------
* Slick Slider
------------------------------------------------*/

  /*------------------------------------------------
    * Logo Slider
  ------------------------------------------------*/
  $('.logo-slider').slick({
    slidesToShow: 6,
    slidesToScroll: 3,
    autoplay: true,
    autoplaySpeed: 2000,
    infinite: true,
    dots: false,
    arrows: false,
    responsive: [
      {
        breakpoint: 1240,
        settings: {
          slidesToShow: 5,
          slidesToScroll: 5,
        }
      },
      {
        breakpoint: 1024,
        settings: {
          slidesToShow: 5,
          slidesToScroll: 5,
        }
      },
      {
        breakpoint: 992,
        settings: {
          slidesToShow: 4,
          slidesToScroll: 4
        }
      },
      {
        breakpoint: 768,
        settings: {
          slidesToShow: 3,
          slidesToScroll: 3
        }
      },
      {
        breakpoint: 492,
        settings: {
          slidesToShow: 2,
          slidesToScroll: 2
        }
      },
      {
        breakpoint: 345,
        settings: {
          slidesToShow: 1,
          slidesToScroll: 1
        }
      },
      // You can unslick at a given breakpoint now by adding:
      // settings: "unslick"
      // instead of a settings object
    ]
  });

  /*------------------------------------------------
    * Testimonial slider
  ------------------------------------------------*/
  $('.testimonial').slick({
    slidesToShow: 1,
    slidesToScroll: 1,
    autoplay: false,
    autoplaySpeed: 2000,
    infinite: true,
    dots: true,
    arrows: false,
    responsive: [
      {
        breakpoint: 768,
        settings: {
          slidesToShow: 1,
          slidesToScroll: 1,
        }
      },
      // You can unslick at a given breakpoint now by adding:
      // settings: "unslick"
      // instead of a settings object
    ]
  });

  /*------------------------------------------------
    * Portfolio Slider
  ------------------------------------------------*/
  var owl = $('.portfolio-slider');
  owl.owlCarousel({
      loop:true,
      items:2,
      margin:15,
      center: true,
      dots:true,
      slideSpeed:20000,
      nav: false,
      autoplay:false,
      autoplayTimeout:3000,
      responsiveClass:true,
      responsive:{
          600:{
              items:2
          },
          1000:{
              items:4
          }
      }
  });

/*------------------------------------------------
* MagnificPopup
------------------------------------------------*/
$('.portfolio-gallery').magnificPopup({
  delegate: 'a',
  type: 'image',
  closeOnContentClick: false,
  closeBtnInside: false,
  mainClass: 'mfp-with-zoom mfp-img-mobile',
  image: {
      verticalFit: true,
      titleSrc: function(item) {
          return item.el.attr('title') + ' &middot; <a class="image-source-link" href="'+item.el.attr('data-source')+'" target="_blank">image source</a>';
      }
  },
  gallery: {
      enabled: true
  },
  zoom: {
      enabled: true,
      duration: 300, // don't foget to change the duration also in CSS
      opener: function(element) {
          return element.find('img');
      }
  }
});

/*------------------------------------------------
* Shrink Header
------------------------------------------------*/
$(window).on('scroll', function() {    
  var scroll = $(window).scrollTop();
  if (scroll >= 500) {
    $(".trans-header").addClass("sticky");
  } else {
    $(".trans-header").removeClass("sticky");
  }
});

/*------------------------------------------------
* Auto close navbar-collapse on click a
------------------------------------------------*/
$('.collapse a').on('click', function () {
  $('.navbar-collapse').collapse('hide');
});

/*------------------------------------------------
* Activate scrollspy to add active class to navbar items on scroll
------------------------------------------------*/
$('body').scrollspy({
  target: '#main',
  offset: 54
});

/*------------------------------------------------
* jarallax
------------------------------------------------*/
jarallax(document.querySelectorAll('.jarallax'));