When setting up LRM on your system, a number of Jenkins jobs can then be created as per the on-boarding and take advantage of the out of the box functionality. The list of advanced features is available for LRM knowledgeable users.
Custom Tasks allow a developer to add functionality at certain stages of the LRM pipeline. For instance, before a kit is sent to translation, one may want to add some specific task. This requires knowledge of Java development. See Custom Tasks