I've been using OneNote as a digital bullet journal for years.  Since I put it together once yearly, I always forget how I did it when the new year comes.  This video is a nice reminder of how to set up a quick bullet journal.  I have the months with dates, different kinds of lists, various notes, etc.  Between Outlook and OneNote, I have everything I need syncing on my phone/computer/tablet.  Now, I'm going to do a bit of a search and look for how to have fun decorating the pages.