The DITA Learning and Training (L&T) specialization is a set of DITA topic types and elements for instructional content (including courses like this one).
You use the L&T topic types to plan your learning content, list objectives, author content, create review materials, and create assessments.
L&T maps organize learning topics into sets of learning objects and group those learning objects into lessons. These learning objects allow you to reuse groups of learning material as well as individual topics.