Sites

FAA

Aeronautical Chart User's Guide (CHUG)

https://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/aero_guide/ 

Chart Supplement

https://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/dafd/ 

Terminal Procedures/Airport Diagrams

https://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/dtpp/ 

FARs

eCFR

Airman Certification Standards

https://www.faa.gov/training_testing/testing/acs/ 

WINGS Safety Program

https://www.faasafety.gov/login/Default.aspx?dest=WINGS/pub/default.aspx