If you are soldering PCBs (Printed Circuit Boards), you need a PCB holder. You can buy one or you can make one. This is my idea of making a PCB holder and 3D printing some of the parts from PLA.
You can support me by buying the featured PCB holder on ebay:
The design on Thingiverse:
You can subscribe to my channel here: https://www.youtube.com/channel/UCpbzEfP3Rt5KhPHmJDyTggQ?sub_confirmation=1