Columns enable you to horizontally organize the content within your sections. They must be located under mj-section tags in order to be considered by the engine. To be responsive, columns are expressed in terms of percentage.
Every single column has to contain something because they are responsive containers, and will be vertically stacked on a mobile view. Any standard component, or component that you have defined and registered, can be placed within a column – except mj-column or mj-section elements.
Columns are meant to be used as a container for your content. They must not be used as offset. Any mj-element included in a column will have a width equivalent to 100% of this column's width.
Columns cannot be nested into columns, and sections cannot be nested into columns as well.
Here is the list of attributes you can use on mj-column tag -