This video shows the concepts explained in Tutorial 1-10 regarding Object Properties in AutoCAD.
Being able to change the properties of an object is a powerful tool as it allows you to copy objects and modify their properties rather than drawing it again from scratch.
The MatchProp command is used a lot. When you offset a line, the new line sometimes need to go a different layer. Use MatchProp for this.
Try different methods of changing properties and see which works best you.