In Poland:
- https://www.podatki.gov.pl/pit/twoj-e-pit/ - Pay the tax stuff people tell you owe them (PIT11 -> PIT37)
- https://www.mobywatel.gov.pl/twoje-dane/rzp-pesel To avoid surprises that someone takes credits to your name
- Rejestr zastrzeżeń PESEL
Registering your Company
A company with solid business foundation acts as a leverage.
Whatever you do, wherever you are - If you find a way to provide some value to other in a more efficient way will bring you very interesting cash flow.
If you are still trapped in a 9-5 job and believe that your time is worth much more, there is nothing stopping you, but to try it.
Remember: A high paying job can make you wealthy, assets can make u rich