I've known a number of people that keep a daily diary just to remember what they need to get done. They review it at the end of the day and determine how to dea

I've known a number of people that keep a daily diary just to remember what they need to get done. They review it at the end of the day and determine how to deal with the tasks. If they have something important that has not been processed, they mark the page with a post-it. It works mainly because you can adapt it to suit your style of working. Also, the more you use it the more you can determine what's important and what's not. If you are afraid of losing the book, take a photo of the page at the end of the day using MS OneNote or any of such apps as a back up. It's simple yet powerful. Apps and such have the downside that you have to adapt to them and you have to learn the never ending variety. Also, nothing beats the portability and cost of a paper notebook.