Want to take faster screenshots, and not have to copy&paste them into another app like Paint to mark them up? Check out LightShot! It does both actions at once. It's lightweight and won't slow down your system, and you can set up a hotkey for it to replace or supplement your Windows hotkey. It's especially good during client reviews and quality control discussions.
*** UPDATED! ***
Posted a 2nd video below showing how to automatically upload your screenshots to your Lightshot account online and post a link (useful for the Skool platform since we can't copy images from your clipboard directly into the comments sections.