Netbeans - Why do I need to make separate library projects and import?

I'm running through some of the some of the tutorials for netbeans like [acrostic example|http://www.netbeans.org/kb/60/java/javase-intro.html] and I can't seem to grasp the organization.
When and why do I need to create a separate library project and import when the MyApp project I created has a node for libraries?
When and why would I just create another class in MyApp source packages node as opposed to importing the class from a separate library project?
Java's organization seemed simple until I tried the IDE. Help.

Thanks so much for the response, I really have been having problems with this.
georgemc wrote:
Well, for starters, a lib project can be shared amongst many other projects. For another, you won't be deploying your app alongside NetBeans, so you'll need to provide all the libraries as well as your app when you do deploy. Having them all kept in a lib project makes this very simpleAfter pondering it I'm comfortable with the idea that MyApp's Library node shows what classes I have imported and that those classes, being custom classes, should be in a separate project.
>
When and why would I just create another class in MyApp source packages node as opposed to importing the class from a separate library project?I don't know. Not really sure what's prompted you to ask this one, to be honest. What do you mean?Ok, bear with me as I try to explain my confusion... If I right click on the Source Packages node of MyApp it presents me with the option to create a new java class. So why not just put all my custom classes and packages in the Source Package node of MyApp instead of putting them in library projects and importing them?
I tried this, assuming all classes within a package would have knowledge of each other, thus obviating import, but that doesn't seem to be the case. Is that it?
>
Java's organization seemed simple until I tried the IDE. Help.Maybe you started using an IDE to soon? They're there to make your life easier. If that's not happening, you don't need it yetI might seem quite green, but I have to dive in to this because the application I am attempting to make requires the nice GUI editing of netbeans and will grow in complexity with time.

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