The client writes "sent it" with a screenshot, and three months later nobody knows which transfer belongs to which booking. A six-column log and a weekly check fix that.
A practical guide to pricing photography packages in Egypt: work out a price floor from your real cost, build three tiers, and answer "that's expensive" without cutting the price.
A practical guide to tracking photography income and expenses: the four numbers that decide your profit, and how to work out real profit per booking instead of reading it off your wallet balance.