A lot means these amounts or more:
sugars 10g
fat 20g
saturated fats 5g
fibre 3g
sodium 0.5g
A little means these amounts or less:
sugars 2g
fat 3g
saturated fats 1g
fibre 0.5g
sodium 0.1g
Salt is shown as 'sodium' on nutrition panels. Most of the 'sodium' in food is from common salt, but other additives or ingredients can add to sodium levels, e.g. monosodium glutamate.