On Daily Log, add a row for each entry, the date and any money in (sales, other income, M-Pesa, bank) or an expense (pick a category and type the cash out). Money in, the daily balance of in minus out and the running balance all fill in on their own, with a negative balance in red and a positive one in green.
The Monthly Summary rolls every entry up into money in, money out and net for each month with a full-year total. Yellow cells are your only inputs. The premium version adds a dashboard of in versus out by month and a running-balance trend, a channel and category analysis, and a printable A4 monthly cash-flow statement. Opens in Excel, WPS or Google Sheets.