For getting expertise/familiarized in CPM Framework, completion of the below Academey Self-Study courses would be helpful.
Pega Customer Service Fundamentals (7.1)
Creating Pega Customer Service Solutions (7.1)
After completing the courses & getting hands-on exposure in your project, give the CCSA Exam (Certified Customer Service System Architect Exam). Below is the Academy - Practice Exam that is available for getting exposure on the Exam.