Countable and uncountable nouns

Currently, I am learning on in my English's Academy the countable and uncountable nouns countables and uncontables.

The words that I am going to use are: Beef, Magazine, CD player, shampoo, potato, bread, grape, meat, toothpaste.

Countable
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Singular: CD player, Magazine, shampoo, potato, grape
Plural: CDs players, Magazines, shampoos, potatoes, grapes

Uncountable
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Singular only: bread, meat, toothpaste [toothpaste is countable].