bootstrap add image code example

Example 1: image responsive bootstrap 4

<img class="img-fluid" src="" alt=""> //This will make your image responsive

Example 2: bootstrap card change image

.card-img-top {
    width: 100%;
    height: 15vw;
    object-fit: cover;
}

Example 3: bootstrap Image thumbnails

In addition to our border-radius utilities, you can use 
.img-thumbnail to give an image a rounded 1px border appearance.

<img src="..." alt="..." class="img-thumbnail">

Example 4: How to insert an image in bootstrap 4

<img src="path to image" class="description" alt="Rounded Image">