A hole-in-the-ground is a place where the dirt, sand or soil has been dug out from the surface, leaving a space or gap below the ground. Sometimes people dig a hole-in-the-ground to build a well or a pool, or to bury something they don't need anymore.
When you dig a hole-in-the-ground, you use a shovel or other digging tools to remove the dirt from the spot where you want the hole to be. You can make the hole bigger by digging deeper into the ground, but you need to be careful, because the deeper you go, the harder it is to dig. If you're not careful, the walls of the hole can cave in, which is dangerous.
It's important to remember that once you make a hole-in-the-ground, you need to fill it back up when you're done using it. This is because an open hole can be a hazard to people and animals who might accidentally fall into it. And, you don't want to have a big hole in your yard that you can trip or hurt yourself on.
So, to summarize, a hole-in-the-ground is a spot where the dirt has been removed from the surface, leaving an empty space below the ground. People dig holes-in-the-ground for different reasons, but always remember to fill it back up and be safe while digging!