Data Structures and Algorithms: Implement specific data structures like linked lists, trees, or hash tables. Solve algorithmic problems involving sorting, searching, and dynamic programming. Analyze time and space complexity of code. Discuss the use cases and trade-offs of different data structures and algorithms. Coding Challenges: Solve coding challenges on platforms like HackerRank, LeetCode, or CodeSignal. These can range from easy to difficult and cover a wide array of topics. Questions often involve string manipulation, array operations, and mathematical algorithms.