Linux is not only the successor of Unix: it was the clone of that already perfectly developed OS! For this reason did Linux never need to copy Windows stuff or methods and did develop itself without getting distracted from its own objectives. And all documentation concerning Unix and, later, Linux was already perfect as Linux came, so that very old document can be deprecated but already very useful, especially translations into other languages as they often can't be published as soon as new developments.

The main difference is, that Linux did never break with the use of commando line: All graphic figures can be considered as (often only) graphic front ends from a powerful unified processing at commando line (=binary) level. All is considered as a «file» and will be handle so, so that the command can generally be used on each type of objects and data. The second difference is, that old version from Unix and Linux also did strongly manage the owners of all objects and data (the initial Windows did miss this performance!) so that you very often have to take caution in Linux don't to hurt the ownership of objects and data: The system refuses you access as well as processing! Third difference is, that Linux doesn't “reinvent the wheel”. As the system is now generally free and open source, developers can use freely the work of predecessors if it good, fast and secure, and include their work into her new development without to need to recode somewhat! We are speaking from as terrible considered “dependencies”! The commando line use of Linux meets this tendency: An application can be only a script in which programs are invoked and parameter passed! But the consequence is of course, that when the dependencies are missing, the application does not work.

If you remember that you will probably avoid some difficulties to accustom in Linux coming from Windows!