Hashes, Arrays, Stacks, Queues, maybe a Linked List
Big O Notation
It's useful for understanding how algorithms work and the limits of what computers can do.
Learn Algebra really well
It's basically what we are doing all day, in an abstract way. Assigning values to variables and then doing operations with those variables is the bread and butter of algebra and coding.
Concurrency and Asynchronous Code
It's everywhere and it's only going to be more important
Basic Database Modeling
You'll need it, so you might as well know it.
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Basic Data Structures
Big O Notation
Learn Algebra really well
Concurrency and Asynchronous Code
Basic Database Modeling