KiCad is a suite of free software to design PCBs.[KiCad on Wikipedia].
I have been using it to make PCBs and it is OK so far. It is also easy to use.
It comes with tools to check design rules and to produce Gerber files for manufacturing.
I have written a getting started guide for KiCad in Myanmar language to take note about my experience and methods. And I combined them with English version guide which can be found on its website [Getting Started in KiCad, March 5, 2017].
My Myanmar version getting started guide for KiCad book can be found at
https://yan9a.github.io/KiCad/kicadmm.pdf