1. Software Debugging & Development | Identifying the program development stage for error correction, debugging with IDE features, and selecting appropriate data types for variables. 2. String Manipulation & Data Security | Implementing `Conceal()` function to mask card numbers, modifying it to process 100 records in a 2D array, and defining parameter specifications. 3. Stack Operations & Data Structures | Initializing a stack with pointer variables, implementing `Push()` function, handling overflow conditions, and explaining memory management. 4. Timer Implementation & Event Scheduling | Using a global tick counter for elapsed time tracking, triggering warning messages 30 seconds before expiration, and stopping the timer accurately. 5. Algorithm Optimization & Logical Structures | Identifying runtime errors in `Process()` function, rewriting selection logic without CASE statements, and handling infinite loop errors. 6. Game & File Management | Assigning game characters to players, storing structured character data in text files, ensuring sequential game save functionality, and handling Boolean field storage.