Study in the States
Website: https://studyinthestates.dhs.gov
Excellent resource page for F-1 international students.
Travel.State.Gov
Website: https://travel.state.gov/content/travel/en/us-visas.html
Provides information on how to apply for a Visa and it’s where you fill out the application for an appointment at the Embassy to obtain a Visa.
DHS
Website: https://www.dhs.gov
Information from visa agencies and all immigration related topics
Viaja Seguro – PR
Website: http://www.travelsafe.pr.gov
Official information from the Government of Puerto Rico on guidelines, mandates, and surveillance notices applicable to any person traveling to Puerto Rico.
https://www.travelsafe.pr.gov/viaja-seguro.html