I used to keep detailed records of the things I planted, when, where, why, how, etc.. How much was harvested, what it sold for. What I preserved etc. etc. etc. Then I couldn't find useful data when I wanted. it.
This is familiar! I had notebooks where I wrote everything garden related and kept the temperature and weather related stuff on a calendar, then I had notebooks where I wrote general family stuff. I was also my mom's legal guardian and kept records for her. I quit and actually burned it all several years ago...set myself free from the fussiness of record keeping.
Now, I'm comfortable using the gut and instinct method and memory when it serves...probably not the best way for many folks but it is working for me at this point in my life. I do lots of observation every day and try to read the plants and landscape for clues for improvement...all of my words were just cluttering up my view. I do take a lot of photos but they are not organized in any way but by digital folder and the date and then stored on flash drives.
When I did keep records, the calendars were probably the most useful as I had weather and what I planted and harvested on certain days and years worth that I could compare although I rarely did.
The journals were just running talk more or less with bits of information gleaned from books or other gardeners.