So if driving from Sacramento to San Francisco...there will be a toll booth i can pay directly crossing the bridge?

Yes you can pay cash only. If you are coming across the bay bridge, look for the signs that say cash/fastrak as opposed to just fastrak when entering the toll plaza at the foot of the bridge. If you enter the city via the golden gate, no stopping, you will receive a bill in the mail to where the car is registered.

Yep, whay Zakaria said

Yes

That sounds about right.

Yes coming back from sac into the city