PCB testing methods during manufacturing and assembly?

I usually work for PCB designing and know some useful design software. I want to know what design software you are using. Is there any high recommendation?

I see recommendations of 2-4 mils voor uitbreiding van het soldeermasker. Maar waarom is het nodig?

I ordered RF PCB design and prototype from my supplier . There are something like a hole, but it is not, on the ground surface. What is the purpose of making these holes? The PCB is inside of the E70 433NW14S LoRa module.