Back when I used to play with electronics as a hobby, I had one go around with the printed circuit board design.
Like the article says, you can do it by hand. You can by the boards, pen and etching solutions from a local electronics shop.
I drew a very basic circuit onto a printed circuit board with a special pen and then dunked it into the etching solution. Everything around the pen ink dissolved, leaving only the basic circuit design. It was pure wireless circuit construction.
Like I said, I did only one run around with the process because it was a little expensive, and if you messed up on your design, you were stuck with the etched circuits. Later I moved on to breadboard circuits which didn’t require any soldering and gave me the flexibility to change out my circuit design as needed.