countable and uncountable

Countable nouns
Boy, teacher, dog, bird, tree, flower, knife, pan, hut, street,
plaza, car, belt, shirt, basket

Uncountable nouns
Money, oxygen, music, traffic, information, knowledge, wool, physics, advice, health, peace, electricity, violence, luggage, garbage

Comment:
Some nouns (watch, television, hair, light, fat, sugar, cheese, spread, …. etc.) can both be countable and uncountable.

I found two hairs in my coffee. (~ countable)
I turned all the lights off and shut the door. (~ countable)
You should cut down on fats. (~ countable)
How many sugars do you take? (~ countable)
You can buy a selection of French cheeses in that shop. (~ countable)
We prefer low-fat spreads to butter. (~ countable)

The police arrived to keep watch on the tunnel. (~ uncountable)
I like to relax and watch television. (~ uncountable)
He works in television. (~ uncountable)

countable
apple,pen,people,finger,fan,computer,bag,book,tv,wach,cup,shop,nose,eyes,
chicken wing
uncountable
juice,hair,water,rice,bread,fat,soft drink,love,light,milk,sugar,oil,cheese,spread,
energy