match properties is a very important & helpful tool .
ok there is how it works, it copies all the properties of an object ( line type, layer , thickness , etc... ) to another object .
For example when working on layer 2 but u want to draw a line in layer 1 so it' faster to draw this line in current layer 2 then use match properties to set it to layer 1 .
someone can think that's not important just select the other layer , but when u have about 30 layers , that will be a big lose of time & effort , it's alot easier to draw in the current layer than match properties of every line to it's layer .
how it works :
select the tool then select the line u want to copy it's properties then click on the lines u want to past these properties to