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learn how to fight with their own weapons, by reading the book "cracking the code"

https://www.losthorizons.com/BulletinBoard.htm

Read also
https://livingintheprivate.blogspot.com
and
Lux pills: #586916

Do you usually pick one country as a tax base?
Or stay flexible and deal with residency only when it’s required?

Your both questions are from a POV of a slave shitizen, not a sovereign individual.
Only shitizens HAVE TO pay taxes because they sign the contract. Others don't.