Tips to do home-made PCB boards

This is a listing of many sites with nice tips about how to do your PCB board:

This link show how to create a PCB board with industrial-like quality:
http://www.homediystuff.com/etching-diy-pcb-printed-circuitt-boards/

Tips for toner transfer method for PCB home manufacturing:
http://acidbourbon.wordpress.com/2014/04/05/pcbtips/

Many useful tips, from good PCB design suggestion to etching material to use:
http://www.electricstuff.co.uk/pcbs.html

Direct PCB printing:
http://www.pabr.org/pcbprt/pcbprt.en.html

Another site about Direct PCB printing:
http://techref.massmind.org/techref/pcb/etch/directinkjetresist.htm