Some immigration applications require you to go to a biometrics appointment. Also known as an ASC (Application Support Center) appointment, the main purpose is for Immigration to take your picture and fingerprints for their records.
All immigrants who use their marriage as a part of their immigration process will need to demonstrate that they have a legitimate relationship. Proving a good faith marriage will not look the same for all couples, but ultimately you need to show that you share a life together.
Almost all green card applicants need a medical examination as a part of their application. However, you must go to a designated civil surgeon for this exam.
Conditional residency is often called the two-year green card. Before it expires, you must lift the conditions of residency in order to apply for a regular green card.