Has been lurking for months, finally to say hello. What would you recommend someone new read first?

As you may have noticed, I have been lurking in these threads for some time now, trying not to post anything, since the quality here is very high, and I did not want to disturb anyone. It is time for a change, however.

What interests me most is the software that is both small and useful. This is what I would like to discuss, as well as the difficult topic of making them survive. I will also leave comments in other launch threads, not only post my own stuff.

What threads or products have taught you the most during the first month here? Is there any unwritten code of conduct for the forums?