What are the visa & residency requirements in San Francisco?

"In order to obtain a visa to live in San Francisco, an individual must first apply for a nonimmigrant visa through the U.S. Department of State. This process requires the applicant to fill out an online application, provide supporting documents, and attend an interview at a U.S. Embassy or Consulate. Once the visa is approved, the individual can travel to the United States. In order to apply for residency in San Francisco, an individual must first obtain a green card. This process requires the applicant to fill out an online application, provide supporting documents, and attend an interview at a U.S. Citizenship and Immigration Services office. Once the green card is approved, the individual can live and work in the United States," mentioned another expat when asked about moving to San Francisco, the United States.