1. A list of all our financial accounts (checking, savings, retirement, etc) and bills. My spouse already has access to all these, but I handle all the day-to-day finances so it would be easy to forget a particular account or bill exists.
2. Phone numbers, URLs, and policy numbers for my life insurance policies.
3. Information about our internet and our off-site backups. Along with complicated networking equipment, I am self-hosting some software like DNS that could cause the home wifi to stop working if it's not maintained properly. I have instructions on how to unplug it all and set up an off-the-shelf router.
4. Instructions on how to get "In Case of Emergency" access to my password manager. I don't think this is necessary but might make a few things easier.
5. Personal advice on getting help and not withdrawing from family during the grieving process
Outside of this, I also have Google Inactivity Manager set up to automatically notify close friends if both me and my spouse pass away. While I'm guessing the police would notify our family somehow, my parents don't have contact information on my closest friends.