Dive into a comprehensive 5-hour tutorial on Mainframe COBOL programming. Learn about COBOL's introduction, history, and dominance in the industry, as well as its program structure and divisions. Explore various COBOL concepts including data types, string handling, control statements, and clauses such as EVALUATE, INSPECT, REDEFINES, and RENAMES. Master essential techniques like using COPYBOOKS, compilation processes for different environments (DB2, CICS, IMS), and file merging. Gain insights into performance optimization, cost reduction strategies, and DB2 integration. Practice with numerous examples and prepare for interviews with a collection of commonly asked questions covering COBOL, JCL, CICS, and DB2.