Data Flow

The main output of eeschema is the netlist
A schematic is turned into a description of "nets"
In order to draw a PCB you must import this information


The main output of pcbnew is a set of gerber files
They are text files that describe each layer of the device
"Edge cuts" is the perimeter of the device
"Cu" means "cuprum", i.e. copper. You have front back and inner layers
The "silk screen" is the set of (usually white) text and drawings
Sometimes you avoid the silk screen on production runs
Al alternative, you can place text on the copper layers too
"Solder mask" is the (usually green) insulating film.

Additionally pcbnew can create "production" files
There are useful for mechanized mounting,
The "paste" layer is a laser-cut metal film, to place the soldering paste
The BOM (bill of material) is a CSV file desribing your components
The position files are use to instruct the pick-and-place tool