Slides only 

<div id="carouselExampleSlidesOnly" class="carousel slide" data-ride="carousel"><div class="carousel-inner"><div class="carousel-item active"><img class="d-block w-100" src="assets/img/640x426.jpg" alt="First slide"></div><div class="carousel-item"><img class="d-block w-100" src="assets/img/640x426.jpg" alt="Second slide"></div><div class="carousel-item"><img class="d-block w-100" src="assets/img/640x426.jpg" alt="Third slide"></div></div></div>

With controls 

<div id="carouselExampleControls" class="carousel slide" data-ride="carousel"><div class="carousel-inner"><div class="carousel-item active"><img class="d-block w-100" src="assets/img/640x426.jpg" alt="First slide"></div><div class="carousel-item"><img class="d-block w-100" src="assets/img/640x426.jpg" alt="Second slide"></div><div class="carousel-item"><img class="d-block w-100" src="assets/img/640x426.jpg" alt="Third slide"></div></div><a class="carousel-control-prev" href="#carouselExampleControls" role="button" data-slide="prev"><span class="carousel-control-prev-icon" aria-hidden="true"></span><span class="sr-only">Previous</span></a><a class="carousel-control-next" href="#carouselExampleControls" role="button" data-slide="next"><span class="carousel-control-next-icon" aria-hidden="true"></span><span class="sr-only">Next</span></a></div>

With indicators 

<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel"><ol class="carousel-indicators"><li data-target="#carouselExampleIndicators" data-slide-to="0" class="active m"></li><li data-target="#carouselExampleIndicators" data-slide-to="1"></li><li data-target="#carouselExampleIndicators" data-slide-to="2"></li></ol><div class="carousel-inner"><div class="carousel-item active"><img class="d-block w-100" src="assets/img/640x426.jpg" alt="First slide"></div><div class="carousel-item"><img class="d-block w-100" src="assets/img/640x426.jpg" alt="Second slide"></div><div class="carousel-item"><img class="d-block w-100" src="assets/img/640x426.jpg" alt="Third slide"></div></div><a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev"><span class="carousel-control-prev-icon" aria-hidden="true"></span><span class="sr-only">Previous</span></a><a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next"><span class="carousel-control-next-icon" aria-hidden="true"></span><span class="sr-only">Next</span></a></div>

With captions 

<div id="carouselExampleCaptions" class="carousel slide" data-ride="carousel"><ol class="carousel-indicators"><li data-target="#carouselExampleCaptions" data-slide-to="0" class="active"></li><li data-target="#carouselExampleCaptions" data-slide-to="1"></li><li data-target="#carouselExampleCaptions" data-slide-to="2"></li></ol><div class="carousel-inner"><div class="carousel-item active"><img class="d-block w-100" src="assets/img/640x426.jpg" alt="First slide"><div class="carousel-caption d-none d-sm-block"><h3>First slide</h3><h5>Lorem ipsum dolor sit amet,dolore magna aliqua.</h5></div></div><div class="carousel-item"><img class="d-block w-100" src="assets/img/640x426.jpg" alt="Second slide"><div class="carousel-caption d-none d-sm-block"><h3>Second slide</h3><h5>Lorem ipsum dolor sit amet,dolore magna aliqua.</h5></div></div><div class="carousel-item"><img class="d-block w-100" src="assets/img/640x426.jpg" alt="Third slide"><div class="carousel-caption d-none d-sm-block"><h3>Third slide</h3><h5>Lorem ipsum dolor sit amet,dolore magna aliqua.</h5></div></div></div><a class="carousel-control-prev" href="#carouselExampleCaptions" role="button" data-slide="prev"><span class="carousel-control-prev-icon" aria-hidden="true"></span><span class="sr-only">Previous</span></a><a class="carousel-control-next" href="#carouselExampleCaptions" role="button" data-slide="next"><span class="carousel-control-next-icon" aria-hidden="true"></span><span class="sr-only">Next</span></a></div>