you do not have a problem getting through the exercise?
when you want to use a image in html, you need to use the image tag:
so, ruby use image_tag, so it knows it need to use a html image tag (
<img>). Does that make sense? ruby converts image_tag into
you also have doubts over this line:
<div class="card col-xs-4">
i don't know what card does, you will have to check your css file, but col-xs-4 sounds like a class you would use in bootstrap, for a grid system. grid system are really nice to make your site responsive. col-xs is used for small screens (smaller then 768px), the total number of cols is 12, so col-xs-4 would be 1/3 of the screen width
edit, card doesn't seem to do much special:
margin: 4px 0;
You do understand html and css right?