I have a notice board in my little office at home. It just has notes about wanted cats / cats for rehoming / cats needing microchipping etc. Just kind of notes about things pending if you like.
we have a calender for all appointments etc, but the main thing I use is my diary. I have one diary & it's my life! Everything goes in there, where I need to be, when, what cats are in / out who's been to the vets when etc, I would be so lost without it, in fact I did loose it once. I had put it down the side of my car seat & I had pulled over to attend to a puppy poo in the back

. carried on my journey, not realising the diary had fell on the floor. A lady walking her dogs found it, picked it up - had a look through, foun a phone number & called it & said to the person that she had found a diary & it had their number in & it must be someone who works with dogs as it was all about visiting & collecting pups, they told her the phone number for work & she called up. I collected my diary & gave her a little something to say thankyou.