It depends on your purpose for coming to the U.S.

Example: Student - F-1 visa, Job offer -H-1B visa, Family - immigrant visa.

If you’re engaged to a U.S. citizen, apply for a K-1 fiancé(e) visa and if you already married, a spousal immigrant visa CR-1 or IR-1 may be better.

If you're just visiting for tourism or business, apply for a B-1/B-2 visa.

If you have a U.S. job offer, you may qualify for a work visa then H-1B, L-1, O-1, or other employment-based categories might apply.