There are various free versions of LaTeX available, but the official version is LaTeX2e, which has been the standard for some time. Users often confuse different class or style files with distinct versions. For Windows users, WinEdt is recommended as it includes necessary components like dvips, while Linux users typically have LaTeX2e pre-installed. Online tools are also available for those who prefer not to download software. Learning LaTeX effectively involves practice, particularly by writing documents and experimenting with the syntax. The math code used in LaTeX is consistent across platforms, with specific formatting requirements like using dollar signs for inline math. Tutorials and documentation can provide a helpful starting point for beginners.