Okay, so imagine you have a bunch of building blocks that you can stack up to make a tower. Now imagine that you want to move one of the blocks from one place in the tower to another place. That's what we call a moving block.
Now, when you pick up the block and move it to a new spot in the tower, you have to be very careful not to knock over the other blocks or make the tower fall down. So you have to move the block slowly and in a very controlled way.
Moving blocks isn't just something you can do with toy blocks, though. In real life, there are lots of things that are made up of blocks that need to be moved safely. For example, if you're moving furniture, you might need to take apart a big dresser and move each section one block at a time.
Moving blocks might seem simple, but it's actually a very important skill to learn because it can help you do things like build tall towers or move heavy things without getting hurt.