The type of journal you keep depends on your personal preference. Some people prefer a hand written journal on a day by day basis and just record whatever happens or what comes to their mind on that day. Personally, I have one that I keep on an excel spreadsheet that has planting dates for vegetables in my area, The date I actually planted each on of them and notes on how they grow etc, when I fertilized etc and when I got the first harvest. Keep it in whatever manner feels right for you.
checking accounts ~ free checking account ~ money market checking account