“pcb” is software to help you draw (“lay out”) the wires for a custom “printed wire board” (“PCB”).

The recommended way to install pcb is to install the complete gaf package. See installation.

No. “Out-of-the-box”, pcb supports 16 copper layers and …

No. Lines on a layer with layer name outline will be interpreted as physical edges of the board. Also see this note in the more comprehensive PCB tips

This is well beyond the scope of this FAQ. There are a few tips at

• Printed circuit board
• http://en.wikibooks.org/wiki/Practical_Electronics/PCB_Layout

Generally, you start with a schematic, run gsch2pcb to generate the netlist. See FAQ-gsch2pcb. Then you might go through the gsch2pcb tutorial

Then you … Hey, did you know about the PCB manual, the PCB tips, and the PCB-quick reference?

See PCB footprints.

There are also some unofficial gEDA footprints at Open Circuits http://opencircuits.com/PCB_Footprints.

The application is a fairly old project, with roots way back in the era of Atari home computers. Its name has always been “pcb”. The current developers have no intention to break that tradition.

gEDA PCB and opencircuitdesign PCB ?