First off I applaud you for actually thinking about this.
The most important thing among others is to print off a spreadsheet every month and keep it by the computer showing all the bills that were paid or need to be paid every month. I happen to have three children in their mid thirties and forties, that I have updated occasionally with the spreadsheet showing bills. Please note there are some bills you only pay once a year or every 6 months like the homeowners, the auto insurance, golf cart insurance and of course your taxes for your house.
If you use Chrome on your computer, then chrome does keep usernames, !!! ( Only if autofillnis turned on), there should be a copy of your username and your password on your computer, yes believe it or not it's there in settings and then auto fill. Of course you must save your username and your Chrome password somewhere easy to find on your computer monitor as an example . So hopefully a relative or good friend or trustee can easily find it.
Some of the other things you should be doing is making a folder called after I die and keeping it somewhere in your house like your master bedroom closet they should include, things like your social security number, your birth certificate, all of the car registrations, and a complete list of assets and liabilities and where they can be found. I have known friends that don't tell their wives or husbands everything just because they don't want them thinking about it. Whether this is right or wrong doesn't matter but you do owe your spouse the ability to go on with life after you. I'm sure I feel left out a few things but you should also have of course your last will and testament a copy in your home as well as at a lawyers or Bank and the living will or a living trust. And actually at least once a month you should discuss your personal finances for the month and what the bills were just so they understand what's coming in and what's going out and don't be derogatory about that really expensive dress she bought.
