Context: LaTeX is a typesetting system. When compiling a document, a lot of really in-depth debugging information is printed, which can be borderline incomprehensible to anyone but LaTeX experts. It can also be a visual hindrance when looking for important information like errors.
Hint: :q!
Sister communities:
Community rules (click to expand)
1. Follow the site-wide rules
sudo in Windows.Please report posts and comments that break these rules!
Important: never execute code or follow advice that you don't understand or can't verify, especially here. The word of the day is credibility. This is a meme community -- even the most helpful comments might just be shitposts that can damage your system. Be aware, be smart, don't fork-bomb your computer.
Ok, go on then, tell the class what underfull hbox is. And no googling!
I already explained this in my post of yesterday in this thread. I've been the TeX admin at our university in my student times. I've been creating styles and \shipout macros. I know this stuff inside out. Heck, I've even read good parts of the source to understand some finer points.
"Using LaTeX" and "programing with LaTeX" are very different things. For most people, LaTeX is a means to an end, for you LaTeX is your whole job. You're the exception, and exception can not be an example.