Screenshots and video captures
You can capture a screenshot by using Ctrl + Overview key (). Use Ctrl + Shift + Overview key () to capture a sub-area of the screen.
For screen captures, you can use the Screencastify extension. If it seems to be having issues recording, check that you're building Chrome and not Chromium (the logo on the taskbar should not be all blue). To build Chrome, make sure your gn args have the keys listed above in the Building Chrome section.