This is a fancy layout using three boxes for each row.
See an example of the grid loop.
If you decide to use this type of layout remember that the length of your page title will be different for each page or post you write.
This is important because in such a small layout box, your title will wrap. This means that the images will not line up nicely if you have a long post title next to a short post title.
You might not want to worry about the length of your post titles. If that’s the case I recommend using a standard one column layout for your listing pages.