Also, there are some excellent 3rd-party books written for X3 - Scott Garrigus is the author of one, and possibly Craig Anderton may have written one as well.
The books are an excellent source for well-explained walk through of the different sets of functionality with X3, and they tie it all together with real-world examples - why this setting versus some other setting, and have great approaches to using all of the features.
And then of course, the Cakewalk forums have a bunch of really knowledgeable folks that will bend over backwards to assist you with questions as they pop up while you are learning.
Go for it - we all collectively have your back,
Bob Bone