1. File operations in programming: reading integer arrays from files, validating input, searching arrays using LinearSearch, and implementing and testing procedures like PrintArray. 2. Object-oriented programming tasks: class creation, private attributes, constructor initialization, getter and setter methods, and overriding methods in child classes for vehicles and helicopters. 3. Stack implementation using arrays: functions for Push and Pop operations, exception handling in file reading, and managing stack data like animal and color names. 4. Inheritance in OOP: parent and child classes with method overriding, adding unique properties to child classes, and maintaining constraints for attributes like speed and height. 5. Error handling techniques in programming: appropriate exception handling for missing files, validating user input, and managing edge cases in stack operations. 6. Practical output generation: combining stack data for display, conditional logic for missing values, and testing complete programs with screenshots for verification.