What are the visa & residency requirements in Heidelberg?

"In order to stay in Heidelberg, one must first obtain a visa. The type of visa required depends on the purpose of the stay, such as study, work, or tourism. Generally, a Schengen visa is required for stays of up to 90 days. For longer stays, a residence permit is necessary. To apply for a visa, one must submit a valid passport, a completed application form, and supporting documents such as proof of financial means, proof of accommodation, and proof of health insurance. To apply for residency in Heidelberg, Germany, one must submit a completed application form, a valid passport, proof of financial means, proof of accommodation, and proof of health insurance. Depending on the purpose of the stay, additional documents may be required. For example, those applying for a work permit must provide proof of employment. Once the application is approved, the applicant will receive a residence permit," remarked another expat in Heidelberg, Germany.