2) What's a good Flat Tax "Hack" for capital gains, personal income or corp tax that you heard of without percentages involved.
If you're an American and have a good income then your issue might be less with the destination country than with the IRS.
Otherwise, the main "hack" is to have
passive income from a no-tax jurisdiction and live in a territorial tax jurisdiction.
3) What's a better country tax and life wise in Europe for an Americans- Gibraltar vs Georgia!
I recommend a vacation first. The vibes are very, very different. Also the expats have quite a different profile.
Gibraltar is expensive, a mix of British and Spanish vibe. Quite small.
Georgia has village life in the mountains, where you can get a big place, raise chickens or whatever. And then Tbilisi is over a million people with a metro system, Western-ish supermarkets and malls. Power cuts, water outages, missing manhole covers on the sidewalk. Also a vibrant atmosphere, great food, lots of atmosphere.
Georgian culture is quite different. I've met Americans here who absolutely love Georgia but if you're used to US coastal city culture (and like it) then Georgia might not be a great fit.