Linux: 3 books in 1 : Linux for Beginners + Linux Command Lines and Shell Scripting + Linux Security and Administration
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Java: Java Back End Programming
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PHP: 3 books in 1: PHP Basics for Beginners + PHP Security and Session Management + Advanced PHP Functions
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Java: Java Basics for Beginners
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R Programming: 3 books in 1 : R Basics for Beginners + R Data Analysis and Statistics + R Data Visualization
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Cobol: 3 books in 1 : Cobol Basics for Beginners + Cobol Database Interaction + Cobol Code Optimization
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