California is a huge state, and LA, Southern California is huge metropolitan area, so too is the San Francisco Bay area.
Public transportation is mostly buses and some amount of light rail, they are indeed options if you are only traveling short distances, otherwise they are not a timely option if they are any option at all.
Within the city of San Francisco, I mostly travel either by my own car, by walking, or by bus or light rail, but SF is very unique in California, but to get to places in the region, outside the city, public transit is not your best bet
Public transportation is mostly buses and some amount of light rail, they are indeed options if you are only traveling short distances, otherwise they are not a timely option if they are any option at all.
Within the city of San Francisco, I mostly travel either by my own car, by walking, or by bus or light rail, but SF is very unique in California, but to get to places in the region, outside the city, public transit is not your best bet