Important DSA concepts:

• Arrays
• Strings
• Sorting & Searching
• Hashing
• Linked List
• Stack & Queue
• Recursion & Backtracking
• Binary Tree & BST
• Heap & Priority Queue
• Graph Theory
• Dynamic Programming (DP)
• Greedy Algorithms
• Bit Manipulation
• Math & Number Theory
• Trie & Advanced Data Structures