Which tab on the Ribbon is used to find commands for placing footings in Revit?

The Structure tab is used to find commands for placing footings in Revit because it is specifically designed for structural components. Within this tab, users can access tools and features that pertain to the structural elements of a building, including foundations, beams, columns, and footings. Footings are integral to providing stability and support for structures, making them a primary feature in structural design rather than architectural design or other aspects.

The other tabs, such as the Architectural tab, focus more on building design elements like walls, doors, windows, and finishes, while the Floor and Roof tabs specialize in their respective horizontal and sloped surfaces. Therefore, for tasks related to structural elements like footings, the Structure tab is the appropriate choice.