It's not so difficult once you get the hang of it, but it could be confusing.
COUNTABLE NOUNS:
Countable nouns are individual objects, people, places, etc. which can be counted. balls, players, courts, etc. A countable noun can be both singular - a friend, a house, etc. - or plural - a few apples, lots of trees, etc. be careful with plural nouns, although for most of the english plural words you can just add an "s" at the end, but there are some plurals nouns called mutated plurals. Such as men, women, mice, people,etc.
UNCOUNTABLE NOUNS:
Uncountable nouns are materials, concepts, information, etc. which are not individual objects and can not be counted.
information, water, understanding, wood, cheese, etc.
Uncountable nouns are always singular. Use the singular form of the verb with uncountable nouns:
That is the equipment we use for the project. There is useful information in that site. that's pretty much it, but I'd like to give you another useful example. There is sugar all over the floor! I'd like two spoonfuls of sugar, please.
You can't count sugar, you actually can, but there's no use counting every single grain! but you CAN count spoonfuls of sugar, or sugar cubes. :)