Most classes are only going to teach you how to sketch UML diagrams. If you were told to create diagrams conforming to a particular UML spec they would all look

Most classes are only going to teach you how to sketch UML diagrams. If you were told to create diagrams conforming to a particular UML spec they would all look very similar. If some came out "wrong" that probably says more about experience than anything else. Being able to effectively communicate your ideas with UML is a skill that takes some practise.