Countable/ Uncountable nouns

Here I leave you a very interesting page about countable and uncontable nouns. It's very complete and easy to understand. Just in case you have any doubts ;)

http://www.englishclub.com/grammar/nouns-un-countable.htm

And at this site you can find how to use many uncountable nouns.

http://esl.about.com/od/grammarforbeginners/a/g_cucount.htm