This paper provides a comprehensive set of guidelines for building an online course based on the e-learning standards. It discusses the steps that should be followed to build a digital repository that facilitates the storage, retrieval, and reuse of the learning resources that comprise an online course in a standard way. The paper also examines various shortcomings associated with adopting the e-learning standards that threaten the viability of widespread reuse of learning resources. Finally, the paper highlights research challenges that must be surmounted in order to gain the benefits of reusable digital learning resources.