What are the visa & residency requirements in Warsaw?

"In order to visit Warsaw, a foreign national must obtain a visa from the Polish Embassy or Consulate in their home country. The visa application process requires the submission of a valid passport, a completed visa application form, a passport-sized photograph, proof of financial means, and a valid travel itinerary. Depending on the purpose of the visit, additional documents may be required. In order to obtain residency in Warsaw, Poland, a foreign national must apply for a residence permit. The application process requires the submission of a valid passport, a completed application form, a passport-sized photograph, proof of financial means, proof of health insurance, and proof of accommodation. Depending on the purpose of the stay, additional documents may be required," mentioned another expat when asked about moving to Warsaw, Poland.