You read how giving the dog a task to do, such as sitting on his bed, helps to distract him and gives you control. This sounds a great idea in theory, but in practice, you aren't sure where to start.
Indeed, this command has other benefits because it is a good distraction technique for dogs that tend to bark at visitors. When given a task to perform, such as going to bed, the dog is less likely to bark. You can also reward his action with an especially chewy treat bone and occupy him further, allowing guests to enter unchallenged.