The right starting point depends on your role and your existing experience with SAFe.
If you are new to SAFe, or want a comprehensive framework overview, Leading SAFe is the right starting point for most people. It covers the full SAFe picture and is suited to leaders, managers, change agents, and anyone working in or alongside a SAFe enterprise. It is also the most widely recognised SAFe certification.
SAFe Scrum Master suits existing or aspiring Scrum Masters working in a SAFe context. SAFe for Teams is designed for agile team members new to SAFe, typically as part of an ART launch. Both can be taken without prior SAFe experience.
For role-specific courses — including SAFe Product Owner/Product Manager, Lean Portfolio Management, SAFe Release Train Engineer, and Implementing SAFe — we recommend completing Leading SAFe first. These courses assume familiarity with the framework.
For a full guide: How to choose a SAFe certification.