...how to master the code:

GCC is the free GNU Compiler Collection
Cygwin is a Linux-like environment for Windows
Python is a free, interpreted, interactive, object-oriented programming language
Perl is a free, semi-interpreted language widely used for web programming
Java is SUN's free, object-oriented, platform independent programming language
Eclipse is an open, extensible IDE for anything and nothing in particular
PSPad - a great freeware programmer's editor
programmers notepad - another good open source code editor
good German C and C++ textbooks by Prinz and Kirch-Prinz
OSC Seminars and Training - free C and C++ textbooks
Java ist auch eine Insel - a good & free Java textbook by Christian Ullenboom
Handbuch der Java-Programmierung - a free Java textbook by Guido Krüger
Thinking in Java - a free Java textbook by Bruce Eckel