What your notes should answer
Most shopping lists become a pile of links. A useful litbuy spreadsheet answers one buying question: after checking the product page, QC or reference photos, price, seller signal, shipping risk, and closest alternative, which item still makes sense?
Keep each row short but specific. Save the original link, category, use case, all-in estimate, evidence status, sizing or spec concern, delivery issue, return tolerance, and the next action.
Before an item becomes a buy
It should have a real use case, a believable total cost, enough product evidence, and a reason it beats the runner-up. If one of those is missing, keep it in checking or wait.
See what to write down