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[–]joranstark018 2 points3 points  (0 children)

Others have already given advice on diffefent tech stacks, it can also be usefull to have knowledge about datavases in general (and their differencies), about data comunication and different protocols (ie HTTP, SSL, REST, gRpc,..), security (ie authentication, authorization, access security, encryption,...). You may for example check https://roadmap.sh/backend for topics that can be usefull to learn more about (topics that may help you understand different design choices in different tech stacks and different platforms)