Mine has been a brain-saver at work. I'm a deputy headteacher, so every day is manic with meetings, appointments, paperwork, phone calls, lessons, observations etc etc.
At the front of mine, I have a page per month for the whole year, so I can 'future plan'. Then I have weekly spreads. On a Sunday morning, I spend an hour mapping out the week ahead. A double-page spread split into sections. One big to-do list, six smaller boxes for weekdays and Sat/Sun share the 6th, space to record dinners for the week. During my working week, I carry the notebook with me and ONLY make notes in it- so any meeting or phone call is recorded in the pages following that week. That makes it much easier to find meeting minutes or notes.
I transfer things from my to-do list from the previous week. If they're not important enough to bother writing out again, they're not important enough to actually do! I write my teaching sessions, meetings, phone calls etc in each day, with an easy code (triangle for meetings, T in a circle for teaching, star for important things, circle for all-day events), all from the online calendar. Then I decide what we're going to eat for dinners.
After it's done, I order Tesco online delivery, using the dinner plan.
When I first started, I looked at Pinterest and spent longer making it look pretty. Now, it's much simpler. I don't bother tracking mood/ sleep/ water/ steps. Washi tape is a cheap way to make it look nice, and I have coloured ink pens so change the 'look' depending on my mood each week. At the back, I write down ideas for birthday and Christmas presents for people.
The process of writing it all out really helps me get a grip on what's happening that week, so I feel much more organised and on top of things. As someone said upthread, you need to think about what YOU will use it for.
I'm happy to put a few pictures up, if you like?