Your site slider should be complete. A complete slider script, like the current code, should contains a title for each slide and a short description. Besides, it needs to have a button on each slide, therefore the user can be directed to a related page. The transition between slides in the following code is both automatic, and manual with next and previous buttons.

HTML
<!-- this script got from www.devanswer.com -->
<main class="main-content"> <section class="slideshow"> <div class="slideshow-inner"> <div class="slides"> <div class="slide is-active "> <div class="slide-content"> <div class="caption"> <div class="title">Slide title 1</div> <div class="text"> <p>Slide description 1</p> </div> <a href="#" class="btn"> <span class="btn-inner">Learn More</span> </a> </div> </div> <div class="image-container"> <img src="http://devanswer.com/codes/files/winter1.jpg" alt="" class="image" /> </div> </div> <div class="slide"> <div class="slide-content"> <div class="caption"> <div class="title">Slide title 2</div> <div class="text"> <p>Slide description 2</p> </div> <a href="#" class="btn"> <span class="btn-inner">Learn More</span> </a> </div> </div> <div class="image-container"> <img src="http://devanswer.com/codes/files/winter2.jpg" alt="" class="image" /> </div> </div> <div class="slide"> <div class="slide-content"> <div class="caption"> <div class="title">Slide title 3</div> <div class="text"> <p>Slide description 3</p> </div> <a href="#" class="btn"> <span class="btn-inner">Learn More</span> </a> </div> </div> <div class="image-container"> <img src="http://devanswer.com/codes/files/winter3.jpg" alt="" class="image" /> </div> </div> <div class="slide"> <div class="slide-content"> <div class="caption"> <div class="title">Slide title 4</div> <div class="text"> <p>Slide description 4</p> </div> <a href="#" class="btn"> <span class="btn-inner">Learn More</span> </a> </div> </div> <div class="image-container"> <img src="http://devanswer.com/codes/files/winter4.jpg" alt="" class="image" /> </div> </div> </div> <div class="pagination"> <div class="item is-active"> <span class="icon">1</span> </div> <div class="item"> <span class="icon">2</span> </div> <div class="item"> <span class="icon">3</span> </div> <div class="item"> <span class="icon">4</span> </div> </div> <div class="arrows"> <div class="arrow prev"> <span class="svg svg-arrow-left"> <svg version="1.1" id="svg4-Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="14px" height="26px" viewBox="0 0 14 26" enable-background="new 0 0 14 26" xml:space="preserve"> <path d="M13,26c-0.256,0-0.512-0.098-0.707-0.293l-12-12c-0.391-0.391-0.391-1.023,0-1.414l12-12c0.391-0.391,1.023-0.391,1.414,0s0.391,1.023,0,1.414L2.414,13l11.293,11.293c0.391,0.391,0.391,1.023,0,1.414C13.512,25.902,13.256,26,13,26z" /> </svg> <span class="alt sr-only"></span> </span> </div> <div class="arrow next"> <span class="svg svg-arrow-right"> <svg version="1.1" id="svg5-Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="14px" height="26px" viewBox="0 0 14 26" enable-background="new 0 0 14 26" xml:space="preserve"> <path d="M1,0c0.256,0,0.512,0.098,0.707,0.293l12,12c0.391,0.391,0.391,1.023,0,1.414l-12,12c-0.391,0.391-1.023,0.391-1.414,0s-0.391-1.023,0-1.414L11.586,13L0.293,1.707c-0.391-0.391-0.391-1.023,0-1.414C0.488,0.098,0.744,0,1,0z" /> </svg> <span class="alt sr-only"></span> </span> </div> </div> </div> </section> </main> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css"> <link rel='stylesheet' href='https://fonts.googleapis.com/css?family=Open+Sans%3A400%2C400italic%2C600%2C700%2C700italic%7COswald%3A400%2C300%7CVollkorn%3A400%2C400italic'> <script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js'></script> <script src='https://cdnjs.cloudflare.com/ajax/libs/gsap/1.19.1/TweenMax.min.js'></script><a style="font-size: 8pt; text-decoration: none" target="_blank" href="http://www.devanswer.com">Developer Code</a>
CSS
body {
  font: 14px/2 "Open sans",sans-serif;
  letter-spacing: 0.05em;
}

.btn {
  display: inline-block;
  padding: 13px 20px;
  color: #fff;
  text-decoration: none;
  position: relative;
  background: transparent;
  border: 1px solid #e1e1e1;
  font: 12px/1.2 "Oswald", sans-serif;
  letter-spacing: 0.4em;
  text-align: center;
  text-indent: 2px;
  text-transform: uppercase;
  transition: color 0.1s linear 0.05s;
}
.btn::before {
  content: "";
  display: block;
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  background: #e1e1e1;
  z-index: 1;
  opacity: 0;
  transition: height 0.2s ease, top 0.2s ease, opacity 0s linear 0.2s;
}
.btn::after {
  transition: border 0.1s linear 0.05s;
}
.btn .btn-inner {
  position: relative;
  z-index: 2;
}
.btn:hover {
  color: #373737;
  transition: color 0.1s linear 0s;
}
.btn:hover::before {
  top: 0;
  height: 100%;
  opacity: 1;
  transition: height 0.2s ease, top 0.2s ease, opacity 0s linear 0s;
}
.btn:hover::after {
  border-color: #373737;
  transition: border 0.1s linear 0s;
}

.slideshow {
  overflow: hidden;
  position: relative;
  width: 100%;
  height: 100vh;
  z-index: 1;
}
.slideshow .slideshow-inner {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.slideshow .slides {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}
.slideshow .slide {
  display: none;
  overflow: hidden;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.slideshow .slide.is-active {
  display: block;
}
.slideshow .slide.is-loaded {
  opacity: 1;
}
.slideshow .slide .caption {
  padding: 0 100px;
}
.slideshow .slide .image-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-position: center;
  z-index: 1;
  background-size: cover;
  image-rendering: optimizeQuality;
}
.slideshow .slide .image-container::before {
  content: "";
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
}
.slideshow .slide .image {
  width: 100%;
  width: 100%;
  object-fit: cover;
  height: 100%;
}
.slideshow .slide-content {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  color: #fff;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
}
.slideshow .slide .title {
  margin: 0 auto 15px;
  max-width: 1000px;
  font: 300 50px/1.2 "Oswald", sans-serif;
  letter-spacing: 0.35em;
  text-transform: uppercase;
}
.slideshow .slide .text {
  margin: 0 auto;
  max-width: 1000px;
  font-size: 18px;
  line-height: 1.4;
}
.slideshow .slide .btn {
  margin: 15px 0 0;
  border-color: #fff;
}
.slideshow .slide .btn::before {
  background: #fff;
}
.slideshow .pagination {
  position: absolute;
  bottom: 35px;
  left: 0;
  width: 100%;
  height: 12px;
  cursor: default;
  z-index: 2;
  text-align: center;
}
.slideshow .pagination .item {
  display: inline-block;
  padding: 15px 5px;
  position: relative;
  width: 46px;
  height: 32px;
  cursor: pointer;
  text-indent: -999em;
  z-index: 1;
}
.slideshow .pagination .item + .page {
  margin-left: -2px;
}
.slideshow .pagination .item::before {
  content: "";
  display: block;
  position: absolute;
  top: 15px;
  left: 5px;
  width: 36px;
  height: 2px;
  background: rgba(255, 255, 255, 0.5);
  transition: background 0.2s ease;
}
.slideshow .pagination .item::after {
  width: 0;
  background: #fff;
  z-index: 2;
  transition: width 0.2s ease;
}
.slideshow .pagination .item:hover::before, .slideshow .pagination .item.is-active::before {
  background-color: #fff;
}
.slideshow .arrows .arrow {
  margin: -33px 0 0;
  padding: 20px;
  position: absolute;
  top: 50%;
  cursor: pointer;
  z-index: 3;
}
.slideshow .arrows .prev {
  left: 30px;
}
.slideshow .arrows .prev:hover .svg {
  left: -10px;
}
.slideshow .arrows .next {
  right: 30px;
}
.slideshow .arrows .next:hover .svg {
  left: 10px;
}
.slideshow .arrows .svg {
  position: relative;
  left: 0;
  width: 14px;
  height: 26px;
  fill: #fff;
  transition: left 0.2s ease;
}
Javascript
var slideshowDuration = 4000;
var slideshow = $('.main-content .slideshow');

function slideshowSwitch(slideshow, index, auto) {
  if (slideshow.data('wait')) return;

  var slides = slideshow.find('.slide');
  var pages = slideshow.find('.pagination');
  var activeSlide = slides.filter('.is-active');
  var activeSlideImage = activeSlide.find('.image-container');
  var newSlide = slides.eq(index);
  var newSlideImage = newSlide.find('.image-container');
  var newSlideContent = newSlide.find('.slide-content');
  var newSlideElements = newSlide.find('.caption > *');
  if (newSlide.is(activeSlide)) return;

  newSlide.addClass('is-new');
  var timeout = slideshow.data('timeout');
  clearTimeout(timeout);
  slideshow.data('wait', true);
  var transition = slideshow.attr('data-transition');
  if (transition == 'fade') {
    newSlide.css({
      display: 'block',
      zIndex: 2 });

    newSlideImage.css({
      opacity: 0 });


    TweenMax.to(newSlideImage, 1, {
      alpha: 1,
      onComplete: function () {
        newSlide.addClass('is-active').removeClass('is-new');
        activeSlide.removeClass('is-active');
        newSlide.css({ display: '', zIndex: '' });
        newSlideImage.css({ opacity: '' });
        slideshow.find('.pagination').trigger('check');
        slideshow.data('wait', false);
        if (auto) {
          timeout = setTimeout(function () {
            slideshowNext(slideshow, false, true);
          }, slideshowDuration);
          slideshow.data('timeout', timeout);}} });
  } else {
    if (newSlide.index() > activeSlide.index()) {
      var newSlideRight = 0;
      var newSlideLeft = 'auto';
      var newSlideImageRight = -slideshow.width() / 8;
      var newSlideImageLeft = 'auto';
      var newSlideImageToRight = 0;
      var newSlideImageToLeft = 'auto';
      var newSlideContentLeft = 'auto';
      var newSlideContentRight = 0;
      var activeSlideImageLeft = -slideshow.width() / 4;
    } else {
      var newSlideRight = '';
      var newSlideLeft = 0;
      var newSlideImageRight = 'auto';
      var newSlideImageLeft = -slideshow.width() / 8;
      var newSlideImageToRight = '';
      var newSlideImageToLeft = 0;
      var newSlideContentLeft = 0;
      var newSlideContentRight = 'auto';
      var activeSlideImageLeft = slideshow.width() / 4;
    }

    newSlide.css({
      display: 'block',
      width: 0,
      right: newSlideRight,
      left: newSlideLeft,
      zIndex: 2 });


    newSlideImage.css({
      width: slideshow.width(),
      right: newSlideImageRight,
      left: newSlideImageLeft });


    newSlideContent.css({
      width: slideshow.width(),
      left: newSlideContentLeft,
      right: newSlideContentRight });


    activeSlideImage.css({
      left: 0 });


    TweenMax.set(newSlideElements, { y: 20, force3D: true });
    TweenMax.to(activeSlideImage, 1, {
      left: activeSlideImageLeft,
      ease: Power3.easeInOut });


    TweenMax.to(newSlide, 1, {
      width: slideshow.width(),
      ease: Power3.easeInOut });


    TweenMax.to(newSlideImage, 1, {
      right: newSlideImageToRight,
      left: newSlideImageToLeft,
      ease: Power3.easeInOut });


    TweenMax.staggerFromTo(newSlideElements, 0.8, { alpha: 0, y: 60 }, { alpha: 1, y: 0, ease: Power3.easeOut, force3D: true, delay: 0.6 }, 0.1, function () {
      newSlide.addClass('is-active').removeClass('is-new');
      activeSlide.removeClass('is-active');
      newSlide.css({
        display: '',
        width: '',
        left: '',
        zIndex: '' });


      newSlideImage.css({
        width: '',
        right: '',
        left: '' });


      newSlideContent.css({
        width: '',
        left: '' });


      newSlideElements.css({
        opacity: '',
        transform: '' });


      activeSlideImage.css({
        left: '' });


      slideshow.find('.pagination').trigger('check');
      slideshow.data('wait', false);
      if (auto) {
        timeout = setTimeout(function () {
          slideshowNext(slideshow, false, true);
        }, slideshowDuration);
        slideshow.data('timeout', timeout);
      }
    });
  }
}

function slideshowNext(slideshow, previous, auto) {
  var slides = slideshow.find('.slide');
  var activeSlide = slides.filter('.is-active');
  var newSlide = null;
  if (previous) {
    newSlide = activeSlide.prev('.slide');
    if (newSlide.length === 0) {
      newSlide = slides.last();
    }
  } else {
    newSlide = activeSlide.next('.slide');
    if (newSlide.length == 0)
    newSlide = slides.filter('.slide').first();
  }

  slideshowSwitch(slideshow, newSlide.index(), auto);
}

function homeSlideshowParallax() {
  var scrollTop = $(window).scrollTop();
  if (scrollTop > windowHeight) return;
  var inner = slideshow.find('.slideshow-inner');
  var newHeight = windowHeight - scrollTop / 2;
  var newTop = scrollTop * 0.8;

  inner.css({
    transform: 'translateY(' + newTop + 'px)', height: newHeight });

}

$(document).ready(function () {
  $('.slide').addClass('is-loaded');

  $('.slideshow .arrows .arrow').on('click', function () {
    slideshowNext($(this).closest('.slideshow'), $(this).hasClass('prev'));
  });

  $('.slideshow .pagination .item').on('click', function () {
    slideshowSwitch($(this).closest('.slideshow'), $(this).index());
  });

  $('.slideshow .pagination').on('check', function () {
    var slideshow = $(this).closest('.slideshow');
    var pages = $(this).find('.item');
    var index = slideshow.find('.slides .is-active').index();
    pages.removeClass('is-active');
    pages.eq(index).addClass('is-active');
  });

  /* Lazyloading
      $('.slideshow').each(function(){
        var slideshow=$(this);
        var images=slideshow.find('.image').not('.is-loaded');
        images.on('loaded',function(){
          var image=$(this);
          var slide=image.closest('.slide');
          slide.addClass('is-loaded');
        });
      */

  var timeout = setTimeout(function () {
    slideshowNext(slideshow, false, true);
  }, slideshowDuration);

  slideshow.data('timeout', timeout);
});

if ($('.main-content .slideshow').length > 1) {
  $(window).on('scroll', homeSlideshowParallax);
}