Going car shopping tomorrow. Give me tips.

do not buy a “warranty” until you post on here price, name of the company and insurance it is backed by.
trust me I have been in the business for long enough to see people get screwed by no name companys that go out of business or F&I people trying to hit a homerun on every deal.
Most dealers will give you at least 30 days to think about the “warranty” unless you are rolling it into your loan.