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Juniper Learning Center - https://learningportal.juniper.net/juniper/default.aspx
Juniper has a bunch of free courses you can take to get spun up on JUNOS. My favorite to highlight is the JUNOS for Cisco engineers ( https://learningportal.juniper.net/juniper/user_activity_info.aspx?id=EDU-JUN-WBT-HW-JSCE ). Since you're used to configuring Cisco switches this helps show you the comparable commands, etc.
Juniper Day One Books - https://www.juniper.net/documentation/jnbooks/us/en/day-one-books
These are books written by actual engineers that go into specific detail on topics. Good ones to look at might be: