DO's and DON'Ts when laying out a PCB
Check your pcb layout for the following criteria, in order to maximize the yield of the pcb production.
1) Respect all our design rules
2) avoid unecessary thin traces over long distances
3) avoid unecessary little spacing between traces over long distances
4) if possible use copper filling on both sides of the pcb
The image below shows an example of a bad pcb design, in which multiple mistakes are made, which could have been avoided