I just use a Google Doc. It allows me to link to details, paste images, etc... ... and if I actually need to diagram: draw.io. I add a new section for each d

I just use a Google Doc. It allows me to link to details, paste images, etc... ... and if I actually need to diagram: draw.io. I add a new section for each day in bold, and then list todos beneath. It's the only productivity habit I've ever kept for more than a year.