Nolo Press's guide to Small Claims court is useful for that.
What you need is the "address for service of process" for the company. You get that from state corporation records. California lookup is here.[1] "GOOGLE LLC (201727810678)" seems to be the main entry. Google uses Corporation Service Company, which is a company that exists to receive and forward legal paperwork, and has an office in every state to receive mail for that purpose. Some kinds of legal documents have to be served by a process server, and there are companies which do that for you, for a fee. You get a report back from the process server on the delivery.
(Some years ago, I sued a retailer, and the process server's return read "person in charge threw papers out front door". It didn't help them. I got a default judgement in small claims court against them. They refused to pay that. I paid for a "till tap and 8 hour keeper", which meant that armed sheriff's deputies went to the store and took the money to pay the judgement. If there wasn't enough money on hand, they'd stay there for a day, behind the counter, collecting any money that came in, and explaining to customers why they were doing that. I had to pay a deposit to the sheriff's office for that, but the cost of that was added to the judgement, so that ended up costing me nothing. This is why businesses rarely ignore lawsuits. Eventually, cops with guns show up.)
[1] https://bizfileonline.sos.ca.gov/search/business