Can I ask a pair of dumb questions?

1) Presumably it doesn't do it any harm if I plug it in to a charger *and* leave it in the sun?

2) Is it significantly better for the life of the solar panel / electronics to not leave it in light that isn't strong enough to charge from? I.e. does it generate current all the time, and 'wear itself out', or will it only generate a current if there's enough to charge with, or is wearing it out not a significant worry?

<-- didn't study much electronics / physics

Thank you.