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- learn how a relational database works (this is always useful)
- learn how HTTP works in general
- learn how to debug code in one language (it's pretty much the same in others, you can recycle most of the knowledge)
- be familiar with the command line
- know how to find code (either using your IDE or grep on the command line)
- knowing the basics of regular expressions will get you far (also to find code in the previous point)
- know how to find solutions using a search engine
- know how to operate git (I would say any source control but git is the de facto standard so you might as well start with that)
- ask questions, especially if you think they're not worth being asked
- learn how timezones work (not kidding, lots of devs are still fuzzy on these)
- learn how unicode and utf-8 work (same reason for timezones)
- have a general idea of how caching (CPU, in memory, disk, HTTP) works as a concept
more at https://dev.to/ben/12-things-every-junior-developer-should-learn-lco
