What are the visa & residency requirements in Scotland?

"To apply for a visa to Scotland, you must first determine which type of visa you need. Depending on your nationality, you may need to apply for a Standard Visitor Visa, a Short-Term Study Visa, or a Tier 4 Student Visa. You will need to provide evidence of your identity, your travel plans, and your financial means. You will also need to provide a valid passport and two passport-sized photographs. To apply for residency in Scotland, you must first determine which type of residency you need. Depending on your nationality, you may need to apply for a UK Ancestry Visa, a UK Family Visa, or a UK Settlement Visa. You will need to provide evidence of your identity, your family ties, and your financial means. You will also need to provide a valid passport and two passport-sized photographs," mentioned another expat when asked about moving to Scotland.