Goodbye evil corp, hello self-employment

What are alternatives to a permanent employment contract? I will present different paths a developer can follow to manage time more efficiently while having an opportunity to earn more money. How different is working on a permanent contract from working on a B2B contract? What steps are required to open your own business in Poland? What elements should you take into account when negotiating the B2B rate? Is a B2B contract the only option when dropping a permanent contract? What should you choose - working in an office or remotely?