Relationships are represented by a line. However, for various reasons, including time, space, and laziness, modelers often do not label relationships in both directions. One reason is that it is often unnecessary to label the relationships if the meaning of the relationship is easily understood. Some modelers use a diamond to represent a relationship, with lines connecting the diamond and entity boxes. Attributes are diagrammed in several different ways or not diagrammed at all.
Some modelers place attributes in the entity box while others use ovals to hold attribute names.
However, most modelers do not place attributes on the diagram at all. They believe that diagramming attributes makes sense only for those simple models, presented in textbooks, that have perhaps a dozen attributes in total. In the real world, a diagram could quickly start to look like a Tokyo subway map as attributes are piled onto the page. A more practical approach is to keep attributes out of the data model and in the data dictionary. Before pressing on, you should understand the distinction between an entity type and an entity occurrence or instance.