Juniper JNCIA-JUNOS course with labs included is a good step in that direction. Course includes 27 different lectures over three hours of learning. It comes with a lifetime subscription, so you can take as much time as you need to fully grasp the content and take the labs in preparation for your certification exam. The classes are taught by Maher Haddad, a noted IT instructor and trainer who has a master’s in Computer Science. By the end you will fully understand configuration basics as well as the Junos OS fundamentals.
Source: https://www.bleepingcomputer.com/offer/deals/learn-juniper-junos-to-prepare-for-your-certification-exams/