Give some more hints what could be possible errors

[synolus-david]

As an example, I will take my recent failure to connect a Nova SDS011 Sensor. First, there was no written notification that the connection should be done on another port (only picture). Second, we could write something about "It is possible that the connection with the openSenseMap takes some minutes longers. Stay relaxed." This would have saved me a lot of time!