What are the visa & residency requirements in Frankfurt?

"In order to visit Frankfurt, a visitor must obtain a visa from the German Embassy or Consulate in their home country. The visa application process requires the submission of a valid passport, a completed application form, a passport-sized photograph, proof of financial means, and proof of travel insurance. Depending on the purpose of the visit, additional documents may be required. In order to obtain residency in Frankfurt, Germany, an individual 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 residency, additional documents may be required," mentioned another expat when asked about moving to Frankfurt, Germany.