Hi Everyone

I am flying on Delta from SFO to VCE (Venice Italy) changing planes at SEA (Seattle) and AMS (Amsterdam).

Can anyone advise me where I check in at SFO? There is a domestic terminal and an international terminal but since my first flight is from SFO to SEA, I am not sure if I should check in at domestic or international. I would of course like to check in bags and confirm my flight connections, and I guess my Covid vaccinations and test results, all the way to Venice. I'm not sure if that can be done at domestic check in. My flight is not for a couple of weeks so I have not been able to check in online and print out my boarding pass so I am just wondering if anyone has done this recently and where to check in etc.

Thanks for any advice!