As above. Best before dates are for guidance and are mostly about loss of texture or flavour. The product may not be exactly how the manufacturer wants it to be but still perfectly edible. Examples are table sauces (ketchup, HP etc), biscuits or jam. Some will degrade quite quickly, particularly bread, biscuits and some confectionery. Other products, often those sold in tins or jars, remain safe for years. We buy French Amora ketchup and barbecue sauce 'cos they're much more tasty than the well known UK brands and have found them perfectly OK months after the BBD. Even Colman's mustard goes off eventually though it has 2-3 years of latitude!!
Consume by needs more care. Fish and poultry can catch you out very quickly. Cheese on the other hand would be unpalatable long before it was harmful.
Mind you I was brought up in the sixties when things were less rigid. That. combined with my mother's relaxed approach to kitchen hygiene have probably left me with a degree of resistance!!