Hello there Dores!
Will here from Shopify, to help out with your shipping and taxe queries :)
Essentially, when it comes to taxes I can't speak in definites as I am not familiar with global taxes. I can say though, is normally our system only works by charging taxes when shipping within the same country/province/state as where you live, versus charging taxes GLOBALLY.
Now, if you want to know exactly what you should be doing - I'd speak to an accountant or tax specialist to make sure you're headed in the right direction. If you need to be charged taxes for any specific state, or country you can go to Settings --> Taxes, and add a country there and a ZIP for where they are located. Once the location information is inputted, our system will pull the most recent taxes we have on file :)!
I hope that helps you! If you need further assistance, definitely let us know. Thanks for taking the time to reach out to us.
Guru @ Shopify