Screenshots
Taking screenshots is useful for capturing errors and documenting pretty much any process. If you help people with anything technical at all, you should be using screenshots. Lots of them. It can be a clunky and slow process, though, which makes me disinclined to do it.
The simplest way to capture a screenshot is to hit the "Print Screen" key, or "PrtSc" on some keyboards. That will copy the whole screen (or screens if you have two displays) to the clipboard. You can then paste them wherever you want. If you just want to capture a single window, then alt + print screen
will copy the contents of the active window to the keyboard.
To save yourself some time, though, I recommend using Snip and Sketch built in to Windows 10. You can access this by pressing win + shift + s
. It'll pop up a box which lets you drag over the area you want to clip, then lets you annotate it. After that you can save it or copy it direct to the clipboard. The tool's a bit simple in that it doesn't let you add text, but it lets you do pretty much everything else very quickly and easily.
My workflow for making documentation is to use Snip and Sketch, mark it up in the tool, copy it to the clipboard and then paste it direction into whatever I'm writing in. This even works in Dendron via the Dendron Past Image extension.