Data structures help students organise information efficiently and are important for writing scalable programs. Arrays, linked lists, stacks, queues, trees, graphs and hash-based structures are common foundations. For an MCA learner, the best way to understand data structures is to connect the theory with a small working example. This point is specifically relevant to the data structures aspect of MCA study. For this specific question about data structures, the practical takeaway is to relate the concept to your own MCA learning goal.