Using this DIY shield kit for Arduino is easy. First, take out the single - sided phenolic board. The copper solder pads are where you'll attach your components. You can solder the components in any way you want according to your design. When using the stacky header set, especially the bent 8 - pin header, make sure to carefully plug it into the Arduino headers. As for the mounting holes, you can use them to secure the shield if needed. For maintenance, keep the board clean and dry. Avoid exposing it to excessive heat or moisture, as this could damage the copper pads and headers. If you're not using it for a while, store it in a safe place to prevent it from getting scratched or bent.