Flameshot is awesome. I used it to train someone remotely at work. Didn't have to spend a long time on the phone and no follow up questions asked. Great to show things to people who are not that great on computers.
I used to use Shutter quite a bit, but Flameshot has been my go-to for a while.
As an aside, I let someone use my computer the other night, and they managed to feed it a good amount of beer. I had a nice-looking no-brand mechanical keyboard from NewEgg. It confused the heck out of me, as it was supposed to be wired. Well, it is wired. It has to be plugged into a USB cable and it's wireless. Yeah... On top of that, the keys themselves are round. I'll adjust to that fairly quickly, but it takes up two USB slots. One is the power, and the other is the wireless dongle. It also says that it's waterproof. We'll see about that! Still, I can't think of a good reason for it to require both. There's no battery in it. When I unplug that cable, it shuts off. I was confused for a good two or three minutes before I figured all this out. It's otherwise a pretty solid keyboard that was maybe $30.

