Fluidal comes with a selection of shortcodes which will work within most of the rows.
The default shortcodes give you columns, lines, spaces, accordions, select menus, before & after sliders and animated counters.
Some of these things can already be done by creating the relevant row, but sometimes you might want to customise a row even further. For instance using a two column block and subdivide one of the columns into a further three columns (so two columns with one of them split into three thirds!)
Or you may wish to add a couple of accordions inline directly below some text rather than creating a brand new accordion row.