KDE Plasma Desktop

GNOME and KDE both provide a full desktop, yet KDE ships with far more confusing dialogs and nested menus. What design goal makes that a feature rather than a flaw?

KDE and GNOME use entirely different underlying toolkits. Which library is KDE built on, and what practical portability does that toolkit give KDE applications?

A colleague asks you which version of KDE they should install. Why is that question technically ill-posed?

You want a distribution that always has the newest KDE Plasma within days of release, but you still want a proven stable base underneath. Which distribution is designed for exactly this, and how does it pull it off?

A user new to KDE keeps opening files by accident just by clicking them once in the file manager. What default behavior is causing this, and where is it changed?

In KDE terminology, what are plasmoids, and why is the term more far-reaching than just "desktop widgets"?

In KDE, what is the panel actually responsible for functionally, and what does that reveal about how the menu and taskbar are implemented?

Dolphin is the KDE file manager. Two of its most useful power features are Split and the Ctrl+L navigation bar toggle. What does each do?

Because of a KDE default, plain clicking in Dolphin doesn't select a file the way it does on Windows. How do you select single vs. multiple vs. a range of files instead?

You delete a file in Dolphin and it lands in the trash as expected. Which shortcut skips the trash entirely, and why is that a trap?

Dolphin can rename files but with little flexibility. When you need to renumber, date-stamp, or pattern-rename a large batch, what KDE tool fits, and what safety feature does it give?

You need to browse a Windows/Samba share and also copy files from another Linux box over SSH, all from inside Dolphin's location bar. What URL schemes do you type for each?

When you connect to a Samba share in Dolphin, it asks for a password once and then stops asking. Which KDE service is holding that credential, and what else does it store?

You change a setting in a KDE system-settings module and close the dialog, but nothing happens. On GNOME the change would have taken effect instantly. What is different about KDE here?

Where do modern KDE programs store their cache, config, and user data, and what older exception should you watch for?

Which component handles the graphical login on a KDE system, and what distro-specific caveat applies to configuring autologin on SUSE?

You want a specific program to launch automatically every time you log into KDE, independent of session restore. What file type does KDE expect and where does it go?

In KDE, changing the desktop's look isn't a single setting — it's layered across several modules. What does each layer control?

Clicking an MP3 opens an audio player, but you'd rather it open something else. What KDE subsystem decides which program handles a file type, and how does it resolve ties?

Beyond Split and Ctrl+L, Dolphin has quick keys for its view mode, its side panels, and hidden files. Which shortcuts do what?

KDE was mid-migration to a new Qt generation. As of the book's writing, which pieces had already moved to version 6 and which hadn't?

On the right edge of the KDE panel sits the "system section." What is it for, and when are you most likely to become aware of it?

KDE System Settings has hundreds of modules, and some touch the system rather than just the desktop. How do you find a module, switch its layout, and unlock the system-level ones?

Where in KDE do you set the keyboard layout, remap the Windows/Alt/Ctrl keys, and reverse the touchpad scroll direction — and what's notable about that grouping?

Out of the box, which programs does KDE treat as the default browser, mail client, and terminal, and where do you swap them?

You want KDE but your distribution isn't marketed as "a KDE distro." In practice, what are the two ways major distributions ship it?

KDE Neon actually comes in four editions. Which one should an ordinary user install, and what do the others trade away?

You dropped some plasmoids on the KDE desktop, but windows keep hiding them and you can't drag them around. Which shortcut surfaces them, and what unlocks moving them?

Two facts make the KDE panel more than just "widgets on the desktop": one about windows, one about its color. What are they?

The application-starter plasmoid is the KDE menu. What two sections does it split into, and what's the fastest way to launch a program from it?

KDE calls them workspaces. What are they, which plasmoid manages them, and where do you set their number if the switcher has vanished from the panel?