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Imo data structures are something you “learn” over time. Don’t stress about knowing them at the beginning. Study the basic ones, arrays, stacks, queues, lists, and trees. Trees is a very deep topic and will lead you down a rabbit hole, so focus on binary search trees. “Basics of java” doesn’t tell us much but if you haven’t learned object oriented programming principles then those should be next. Afterwards I suggest you learn exceptions, interfaces, generics (very important topic), and the java collections framework. Regular expressions are useful to know as well. Here’s the java developer roadmap as a reference.