To add this block to a post or page, click the black plus sign and type in “little category” in the search field to find it.
To edit the block, see the settings in the right-hand sidebar. If you need more space, click the pencil icon on the block to switch to Edit Mode. While in Edit Mode, the settings move from the sidebar to the Block Editor. Click the eye icon to switch it back.
For each block, choose a title, a link, a description (optional), and upload a picture in the settings window. You can add more blocks by clicking the Add Block button.
You can also change the order. First, to make things easier, click the top left-hand arrow to collapse each block. Next, click and hold to drag the row item into a different order.