Tell us about yourself!
there is no real reason, it is as good as John5777155 but shorter :)
Hi,nice guide, but maybe you want to add that the jumper must be set to JD-VCC to VCC, or nothing will happen with the relay.
Step5 ... It would be much nicer if you route the cables on the top side and try to make them with 90° angles, would look much cleaner