Too Long; Didn't Read
The transclusion directive is a way of including content from one template to another. Transclusion allows you to nest the content as HTML inside your directive tag. It is a very good solution for making consistent cards in every place it is needed. It allows you not needlessly repeat yourself when creating directives in your application and to make your templates more versatile. I really recommend using it often across your application directives, and it is easy to use it with a real-life example. The directive is something that is not described properly with AngularJS docs, but with a little explanation and real life example, it becomes easy.