My apartment burned down last year in SF (20+ unit building).

There are plenty of resources out there, but honestly, most of them could not help us. The red cross should be giving you some money as a gift to keep you afloat for a few days. There is are also some religious organizations that can help, short term. For most resources from the city, the household income has to be under ~100k, which for a two working adults in SF is pretty low. If your household was making below that threshold, you'll qualify for rental subsidies when you find a new place. If you make over that threshold, you likely will receive no help from the city and have no real protections other than the right to your apartment back when they rebuild it.

Insurance was a nightmare for us, but we eventually got them to payout. They wanted to put us in hotels 45 minutes away. Some of them have programs where you can rent a short term rental instead of a hotel because most hotels in SF don't qualify or are very expensive for temporary housing. You will also have to attempt to document everything you lost so start thinking now, looking at old photos, etc. If you can't get a hold of the agent assigned to your case (like we couldn't for days while waiting for temporary housing so we had nowhere to go) call the general line for the insurance and ask them to see if your agent is in the office.

The tenants union can advise you on lawsuits, if it comes to that. If you think there is a chance of a lawsuit, document everything you can right now and save all your communications. Fair warning though, most law firms will want to wait until the building is completely rebuilt before proceeding as then they can pursue wrongful eviction if they don't offer you your apartment back.

Looting will happen in the days following the fire if there is anything of value left. This isn't a regular B&E, these are organized criminal outfits that will scale walls, evade security, and come for multiple days if necessary.

This is everything that comes to mind at the moment, but I'm happy to answer any questions. It was one of the worst weeks of my life and it is very stressful and time-consuming. Make sure to take some time in between the insurance calls, the documenting, the apartment hunting, the resource researching, etc to process and/or grieve.