Rows are the building blocks of your marketing pieces in the Email Editor. Rows will be dragged into your marketing piece. Some rows will have content already in them, while others are empty.
Once placed in a marketing piece, rows can be rearranged by hovering over the row in the piece, then dragging the 
icon, and dropping the row into the desired location.
Rows come in a few different types:
Empty - these rows are true to their name, and are empty so you can drop content types of your choosing into it. You can scroll through the options to choose a row with the proper number of columns, width of those columns, etc.
Headers - these rows are intended to be placed at the top of your template, and will usually contain things like headlines, logos, etc.
Footers - these rows are intended to be placed at the bottom of your template, and will usually contain things like your profile photo, contact information, etc.
Body - these rows are intended to be placed in the body of your template, and can vary widely depending on what you're looking for.
With any of these types of rows (aside from empty rows) you can search for content by keyword. These keyword tags are maintained by your marketing team, along with some default ones provided by rezora. Some common ones you might be looking for are "listing", "holiday", or "recruitment".