which css property should be used to make a responsive image code example

Example 1: responsive img

.responsive-img {
  max-width:100%;
  display:block;
  height:auto;
}

Example 2: responsive image in css

.responsive_img {
    width: 100%;
    height: auto;
    object-fit: cover;
    /* Prevent the image from stretching. So it crops the image to prevent from awkward stretching */
}