Because speakers interact with the room in which they are placed, paying attention to the placement of your speakers within that room can make a big difference in sound quality. With your speakers optimally positioned, your system will sound better. And, in my experience, better sound leads to discovering more music.
And more music leads to more fun.
So, where should we begin? John Atkinson has made speaker setup a bit easier with his essay, "Getting the Best from Your Loudspeakers." JA takes the time to go over some of the basics