On the Cash Book tab, add one row per transaction: the date, whether it is income or an expense, a category from the dropdown (crop sales, milk, livestock, seed, fertiliser, labour, transport, feed, vet and more), a short note and the amount. The running balance updates on its own, so you always know where you stand.
The Monthly Summary totals your income, your expenses and your profit for each month, so a season stops being a blur and becomes a set of numbers you can act on. Yellow cells are the only ones you type in; everything else is a locked formula. It opens in Excel or in Google Sheets on your phone. When keeping it by hand gets tiring, Biashara Yangu can keep the books for you automatically.