I kept a binder for years with all seed starting, and rooting methods to keep track of what worked and what didn’t. I also had a fruit tree journal and I found that it became too tiring as so much was weather dependant and I can’t control that variable at all.
I did find, however, that bloom time and harvest date records is helpful as it allows me to count the days it took for a particular variety to ripen, and a map of where everything is located is a must for me.
I now just keep a sort of journal that, along with a few paragraphs of growing notes, includes odd bits of information such as a late June snow, grandkids getting trapped in the electric goose fence, or the day we ran the cattle to pasture and they stampeded over my garden twice! Once on the way out and again on the way back because after they reached the road they decided they would rather stay home. There is no saving a carrot row that has been punched down with a cows hoof, or a lettuce that sports a cow patty mulch.