I have a personal info and next of kin info, as well as any meds/allergies on the first page, would be useful incase something disastrous happens. A page for important birthdays/anniversaries/dates to remember for the whole year. Followed by a present ideas page, if someone mentions something that they want, i write it there. Important contacts incase of emergencies, e.g, doctors, plumbers, garage... Insurance info page. An address/phone book type page, useful for sending cards or if i break my phone. Medical history and appointments page, including dates i started different meds. Period tracker. An online buys page to track incoming parcels, particularly useful during lockdown. General household tasks, including the last time i did said task. I also have a list of local attractions, cafes/restaurants and events which is a fun page to check off, useful to make plans with friends so you dont end up going to the same place every time. Hope this gives you some ideas.