Explore the fundamentals and advanced concepts of COBOL (COmmon Business-Oriented Language) in this comprehensive 5-hour tutorial. Delve into the history, dominance, and continued relevance of COBOL in modern business applications. Learn about program structure, data types, control statements, string handling, and file operations. Master essential COBOL features such as PERFORM, IF-ELSE, EVALUATE, STRING, UNSTRING, and INSPECT statements. Discover how to work with COPYBOOKS, REDEFINES, and RENAMES clauses. Gain insights into the compilation process for various environments, including DB2, CICS, and IMS. Explore performance tuning techniques and cost optimization strategies for legacy systems. Prepare for COBOL interviews with practice questions and scenario-based examples. By the end of this tutorial, develop a strong foundation in COBOL programming and understand its crucial role in business-oriented applications and mainframe environments.