SUSE 10.3 is a good choice for someone coming from Windows--simply because many things are similar. More generally, there are a few things that are becoming de-facto standards. For example, the following seem to work about the same on all systems:
--- rt-click for logical commands in context
--- ctrl-C, ctrl-V, ctrl-X, ctrl-P etc.
--- drag and drop move and copy
One thing that is very different is the package manager--there is really no equivalent in Windows. In the menus, it is called different things. In SUSE it is YAST, but it might also say "install software" or something similar. Take the time to get familiar with the package manager and always use it for new SW if at all possible.
By what language linux is called?
I don't understand this question.