This is an excellent educational overview of project portfolio management according to the four aspects of the PPM lifecycle. Earn 1.25 PDU's. This video is broken into six parts:

1) An overview of project portfolio management (definitions and the portfolio management lifecycle)
2) Lifecycle Phase #1: Define the Portfolio (project selection)
3) Lifecycle Phase #2: Optimize Portfolio Value (project prioritization, resource capacity, portfolio planning)
4) Lifecycle Phase #3: Protect Portfolio Value (status reporting, portfolio risk management)
5) Lifecycle Phase #4: Deliver Portfolio Value (benefit realization, portfolio value management, portfolio maturity)
6) Portfolio Operations (PPM roles, portfolio communications, reports and analytics)

Here is the list of key subjects and related articles:
Project Portfolio Management (PPM): https://acuityppm.com/ppm101whatis...
Work Intake: https://acuityppm.com/bestpracticef...
PhaseGate: https://acuityppm.com/ppm101project...
Project Prioritization: https://acuityppm.com/ppm101project...
Resource Capacity Planning: https://acuityppm.com/bestpractices...
Portfolio Optimization: https://acuityppm.com/ppm101project...
Portfolio Planning: https://acuityppm.com/ppm101portfol...
Portfolio Risk Management: https://acuityppm.com/ppm101portfol...
What is a Portfolio Manager?: https://acuityppm.com/whatisaproje...
Portfolio Communications: https://acuityppm.com/ppm101theoff...
Priority Matrix: https://acuityppm.com/ppm101howto...
Benefits Realization: https://acuityppm.com/ppm101benefit...
Portfolio Management Maturity: https://acuityppm.com/ppm101assess...