Although most of my posts are indeed related to same project - they are on completely different matters. This is why I have opened new topics for each subject.
asking about 'Arduino digital pins' is relevant to any project I may or may not work on.
Same goes for 'powering Arduino with 9V' question, and for 'Loop over a specific array of numbers'.
In different forums I'm member of I have been told is better to open a new topic if it is on different matters. I had no intention to do heavy cross posting (I just discovered that term).
edit: it might be question relevant to other members so find a specific topic regarding a specific question is might be better(?)
In any way - As people here helped me so much, I will stop opening topics for a while. I had no intention to do harm and disrespect people time. I do sorry if I did.