Countable nouns are: Nouns that we can count and they have a singular and a plural form. School: table, pen, teacher, student, desk, textbook, test, essay, grade... Fruits and vegitables: range, banana, apple, pear, potato, eggplant, onion, tomato... General: man, woman, problem, market, friend, newspaper, car, road... Examples: Sara has a lot of friends. I got a very hight grade in the test. Uncountable nouns are nouns which we can not count and they do not have a plural form. Food and drinks: meat, cheese, tea, coffee, water, milk... General: money, love, patience, English, poetry.. Examples: How much money do you have? I want a glass of water, please. Countable and uncountable: Chicken, fish... Examples: I ate a lot of fish yesterday. I bought a chicken from the market. The following link helps you find an exhaustive list of countable and uncountble nouns: https://www.engvid.com/english-resource/countable-and-uncountable-nouns/