This Udemy 5G course is an excellent theoretical primer for understanding 5G NR and core networks. It does not replace vendor-specific training (Nokia Bell Labs, Ericsson) or hands-on lab experience, but for $84.99, it delivers solid foundational knowledge with high-quality visuals. Recommended with the caveat that learners must supplement with practical simulation tools.
While each course varies, most comprehensive programs cover a core set of topics: 5G Masterclass: Architecture, NR RAN, Core and Call flows
For those focusing on the back-end, this course dives into Service-Based Architecture (SBA), network slicing, and 4G interworking.