Tip: How do I copy Windows infobox text to the clipboard

After reading it, you will find that it is indeed a very simple trick, but after playing with the computer for so long, I did not know it at all. Whenever an error window pops up that I don't understand, I usually type those keywords into the search box myself. I didn't realize there was a way to copy all the text directly to the clipboard by pressing Ctrl+C. Looks like I still have a little Windows secret to discover.