PSM I is Scrum.org’s Professional Scrum Master I: the Scrum Guide (current version), not SAFe and not PMI-ACP. Open-book in spirit (you must know the Guide).
Start practicing: PSM I practice →
Read the Scrum Guide until you can explain accountability of Scrum Master vs Product Owner vs Developers without mixing SAFe or waterfall.
Path: PMI vs Scrum.org if you are choosing a PM brand.
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