Here are some useful links:

AOPA

Aviation Weather

Airplane Flying Handbook

Cessna 172-S POH

FAA

Find an Aviation Medical Examiner (AME)

Free Private Pilot Knowledge Exam Practice Questions

Gold Seal Online Ground School

Integrated Airman Certification and Rating Application

Martin Fass, DPE (Practical Exam Scheduling)

Our Facebook Page

Pilot's Handbook of Aeronautical Knowledge

Weight and Balance Handbook