Tiles are a new feature in website version 2018. You may find them on right side of boxes and in left menu of subpages. Promote in them such information that the visitors should learn even if they got to your website not through main page, but subpage.
A tile contains a headline that is at the same time a link. Do not use too long headline, two lines maximum. The picture you use on a tile should be a white icon on transparent background. Though this is not a strict instruction, because at this moment there is on official list of icons. If you do not use your own picture, the caritas logo is filled in automatically.
In case you activate more than three tiles in you list of tiles, only first three tiles in the list are displayed, rest is ignored.
For tiles setting go to CMS3 > Tiles.