How to Apply for US Visa:
In order to understand the application process, you will first need to understand the categories under immigrant and non-immigrant visas.
Categories Under Immigrant Visa:
Family or Relative Sponsored:
Spouse of a citizen
Spouse of a citizen awaiting approval of I-130
Fiancee of a citizen
Family members of either a citizen or a Lawful Permanent Resident (LPR)
Categories Under Non-immigrant Visa:
Athletes and sports persons
Au pair
Business traveller
Crew member
Diplomats and foreign government officials
Foreign military professional stationed in the US
Employee of a designated international organization including NATO
Religious traveller
Trader or Investor
Experts in special applications
Spouse and kids of an LPR
Temporary laborers
Temporary agricultural workers
Leisure traveller
Transiting the country
Victim of a crime
Victim of trafficking
Physician
Journalist or media personnel
Performing artist
Traveling for training, event or conference
Read the main page of US Visa in order to know the application eligibility of all these categories of visas.