I got a HTML code in the following using bootstrap 3.3.7, using thumbnail class the images can be resized and fit into the grid perfectly.
In Bootstrap 4 you can do the following.
For columns col-xs- doesn't exist anymore, replace with col-. The default is xs.
For the thumbnail, you can use the img-thumbnail class on the img element instead of on the div element.
Additionally, to achieve 0 padding on each column and row, you can override Bootstrap's padding by adding a custom style rule.
.row > .col-lg-4,
.col-6 {
padding: 0;
}
The resulting Bootstrap 4 file would be the following:
Project
Pictures of Coffee