If you’re not documenting what you do, you’re setting the stage for failure.
There are 2 grocery stores in my neighborhood. I mainly go to one, due to fast service. But sometimes the shop is out of stock.
I asked the shopkeeper why he doesn’t keep stock all the time. He said he does the purchasing only when the need arises.
So, I told him that he could keep track of his inventory by writing down the quantities of each item sold every week, allowing him to make purchases ahead of time so that he doesn’t lose customers.
And that should also allow him to forecast demand as well as identify fast moving items, which ultimately allows him to plan a budget and calculate profit/loss.
He was very excited about the suggestion. Hopefully he implements it and benefits from this.