I own the game since beta, but don't play much. It's simply lack of time. For the same reason I hardly watch dev streams and sometimes don't visit the forum for months.
So in many aspects I'm still a newbie. Could someone do me a favour an tell me:
1. What are the yellow exclamation marks next to ships in the ship designer about?
2. When negotiating with others some techs have a little yellow/golden star nearby. What does it mean?
3. Sometimes it seems other civs have techs to trade I already researched - is that true or a wrong observation on my part?