The Pega 7 Fundamentals (7.1) is a free course available on the Pega Academy. There is no charge to enroll in the course and take it.
The System Architect Essentials I (7.1) course is available for 225 credits. Credit can be purchased directly on the Pega Academy. Asking anyone to share their materials would be a violation of the Terms and Agreement which they entered into when enrolling in the course.