Discussion on:

Fedora's crowdsourced open source documentation achievement

Has always been a Linux philosophy, the source code is always available. If you like to tinker, change things, etc, you can. It's free. You don't have to pay some proprietary company just to use it, and then wait for some fix from a developer, or try to tweak some application that doesn't work to suit your needs and find out it' damn near impossible unless you're a genius, and even then it's "illegal" to reverse engineer the damn thing that you PAID for and therefore "own."
Now, if the "other" major OS's would get off their butts, open all their source codes, stop all the damn lawsuits over who owns what intellectual property, and stop trying to make a "profit" (how many billions do you need to steal from the consumer before you're happy) and just make the users happy, AND part of the company... oh wait that's Linux job!

So far I cannot say the information is first rate. I've run into this for example:

"Generally speaking, widgets used by one desktop environment cannot be used in another. The availability of a widget may dictate your choice of desktop environment."

What is to stop say KDE from using a Gnome application? Personally I do it all the time. As long as your system has the libraries I don't see what the big deal is. Maybe I don't understand what they're talking about though, which isn't such a good thing either if the goal of the book is for information purposes.

Widgets are not applications. Widgets are the weather thingy or the system monitor on your desktop, not your text editor or pdf viewer.

Yes, you can install gtk libraries and use gedit in KDE if you want, but you cannot use gnome-network-manager in KDE.