Yep, I log every activity into a Word document, and use my Calendar for reminders/recurring events. I could do a spreadsheet or database but I find Word good enough and allows me to go back and see/find exactly what I did/when/why. I use a set range of keywords/headers, e.g Water:, Feed:, Change:, New: Observation:, Pollination: etc. for each entry and automatically stamp the date/time above each entry, makes it easy to go back and use the find feature quickly. I'm a detail freak, which comes in handy as I tend to also experiment/try stuff, having it logged allows me to see what works and what doesn't, vs. relying on gut/feel/memory. Even basic things like watering can easily be forgotten or mixed up when you have multiple grows on the go, e.g. right now I have new seeds germinating, some seeds that popped last week and now in party cups, some seedlings in party cups 12/12 straight from seed, 2 veg cabinets going, a breeding project/tent, and my main flower room finishing up a round. With so many different stages on the go, if I didn't log something, I'd fuck something up for sure. It allows you to see patterns also like frequency of watering through the different stages of growth. Regardless of what you use to log, the key is to log it, in other words log it or it didn't happen...