Is it normal for it to mention a fee if you decide to wuit the company or leave abrubtly to another country, and would they really be able to go after you for damages up to thst contract in Poland
No and no.
lso, if you steal a client and get paid directly is this something thry could get you for
Yes, if it is mentioned in the contract. In reality this doesn't happen. It is generally a bad thing to do, especially if you want more work in that town.
and again how would a dourt in Poland force you to pay if y
The bailiffs are happy to wait until you've got some income/assets.