I’m a 15 year old flying alone, not as an unaccompanied minor. I have a 1 hr layover at this airport for a domestic flight. Any tips for finding my next gate / switching terminals if needed?

Always look up the airport map before arriving so that you know exactly where to go. Also, only talk to airport employees in uniform and in crowded areas. Never let anyone "lead you there."

Safety? ?

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Can ask the airport staff for inquiries

Yes, if you are unfamiliar with SFO, the signage has always been confusing. So check with, phone Both Airlines!