I started mine 20-25 years ago when I realized if something happened to me, H would have no idea that most of our life insurance and bank accounts even existed. I didn’t want my kids to suffer because he didn’t know. So I started my document as a password protected Word doc. It still is mostly, though I also have an excel spreadsheet with cleaner summaries of things. I’ll merge it in the document 1-2x year and print it out for a copy on our at home safe. It also resides on my one drive account.
Are you looking for more specifics about what to include? Because that would depend on the level of knowledge an out your life - and how life operates in general - of the people who need to know. In my case, H knows nothing. He’s completely dependent on me and has no desire to learn. Should I go first, the kids would have to help him 100%.
And I’m not saying my document is perfect. I always am finding things to add and ways to revamp it, so it will hopefully be easier for those who might need it someday. But for many families, it would be overkill.
Edit - out net worth is also super low for those on cc. Our lives are pretty simple and straightforward too.