carousel is a powerful tool for image slides. we need to add class="carousel slide" to div element and add .carousel-item to inside slide.
class="carousel slide"
.carousel-item
To get previous and next control add data-slide="prev" and data-slide="next".
data-slide="prev"
data-slide="next"
To get carousel indicators add class="carousel-indicators" to ol.
class="carousel-indicators"
ol