That's just the tip of the iceberg of cool and useful stuff you can do with KDE Plasma (and Kwin).

Another tip: Did you know that KRunner (Alt-Space) can do unit conversions? Type Alt-Space and 10cm or something like that and it'll give you that value in inches.

Another: You can bind shortcuts to mouse buttons like Ctrl-Alt-Right (click) And Ctrl-Alt-Left to say, switch desktops right/left.

You can type Ctrl-i in Dolphin to filter files. So if you're looking at your enormous downloads directory and you want to see all the .png files you can type Ctrl-i, png and it'll only show you files with png in their name.

KDE's "get hot new stuff" framework works with Dolphin "actions" (context menu file handlers) so you can go into the settings—>Context Menu and click on "Download New Services" to browse tons of free scripts/tools that let you do things like file conversions, write disk images to USB drives, get checksums, etc.

I actually made a personal script that converts videos to looping .webp files (or just sets WebP files to loop forever). So I can right click on a .WebP, .webm, .mp4, etc and it'll run ffmpeg on it in the background.