What’s the hardest part of keeping track of a farm?

I built Mazraati after getting tired of keeping farm records in different places.

Some things were in notes, some in spreadsheets, and some were just in my head.

While building it, I realized I might be solving the problem the way I experience it, so I’d love to hear from other farmers:

What’s the hardest thing for you to keep track of on your farm?

Crops, inputs, costs, harvests, profitability, or something else?

I’m especially interested in what you still use paper, spreadsheets, or memory for.