It depends on your kingdoms ROE (Rules of Engagement) Most kingdoms have a dedicated chat room for this, and you register the coordinates in it, however it can change, plus it doesn't always guarantee other players will obey, you do get the occasional outlaw lol. Also when your kingdom opens up to the rest of the world map there's no stopping players outside coming in and attacking. 🙏🏽💯
After the captain active and research has been started, what if we deactivate that captain and hire another one does it make the same way or do we have to wait till the research has been completed, please answer me
You can switch captains after, you don't need to wait however, whatever captains you have active once research or build is completed, they will acquire the XP generated from it. 🙏🏽💯
There's many ways to get more silver, you can build your own villages (but it costs architect blueprints) then you'll need to mine them the same way you mine any resource on the map. You can get gifts from clan chests or your own chests. Also produce from your mansion buildings in your city. I'll link a video for you