These are the categories where many households feel grocery inflation most clearly. The best way to save is not to chase every discount. It is to compare the right products in a consistent way.
When looking at rice, cooking oil, tissue, or detergent, pack size matters. A larger pack may look expensive but still be the better value. Bonus packs and multipacks should also be treated carefully so you are not comparing different quantities as if they were the same thing.
If you are trying to lower weekly spending, compare the categories that move fastest in your home. For some families that is rice and cooking oil. For others it may be milk, diapers, detergent, or tissue. Savings become more meaningful when they apply to items you buy often.
Search-based comparison is great for finding likely price leaders. After that, browse one or two store pages to complete your basket. This gives you both savings and practical convenience.
A weekly basket can be distorted by non-food essentials. Soap, toothpaste, tissue, and cleaning products deserve the same attention as staples because they are easy to overlook and often repurchased.