One thing about Xfce that I love is the ease of making shortcuts. There are three nice ones for screenshots:
PrtScr for full-screen, Shift-PrtScr for a rectangle, and Alt-PrtScr for the active window. (Windows has Windows-Shift-S, which is full-featured and allows you to scribble over screengrabs before saving or copying them. Macos was the leader in this field for years, but has fallen behind, their screenshotting facilities being essentially the same as with macos 10.4 Tiger from way-back-when.)