To check the Visa bulletin to see if your visa petition is almost ready for you to immigrate
https://travel.state.gov/content/travel/en/legal/visa-law0/visa-bulletin.html
USCIS link for all filing fees (to find out how much USCIS charges to accept the application)
https://www.uscis.gov/forms/our-fees
ICE locator (to find someone who is detained)
https://locator.ice.gov/odls/#/index