Questions...
>2 GFCI outlets by paired sinks also out. Other lights and fan by toilet are fine.
Do you mean the 2 dead outlets are both the type with GFCI test and reset buttons? Or are they on a common circuit with a GFCI circuit breaker?
I do not recall if you mentioned if there is a GFCI breaker that is tripping? Or is it a regular breaker? Post a picture.
>The circuit breaker in garage has flipped and when I move it totally to the off position and then attempt to reset it, it won't reset.
Try moving it to the full off position, and leave it there for a few minutes. Then try reset.
>If the light bulb is now blown ... would that trip the circuit
If bulb is shorted, then it should trip breaker. Not generally a GFCI issue, but a simple overload. Put in a new bulb. Easier than trying to guess.
If that is tripping a GFCI, that means there is a current leak path from the hot lines to ground. That should not happen in a light bulb fixture. That would be a wiring problem (frayed, pierced...)
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