The toner transfer method is one of the most common and cheap way to make Printed Circuit Boards at home.
Despite it's popularity this method has problems with it's repeatability since it has way too much factors that must be cleared in order to get some decent and stable results.
The method itself is pretty straight forward.
Print your circuit with your laser printer then put the printed circuit face down over a copper clad so that the toner touches the copper surface and then apply heat in order to transfer the toner from the paper to the copper.
Then you remove with water the paper and the toner will be printed into the copper clad.
Now you are ready to etch the board.
Then drill place the parts and solder.
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