I've seen a lot of people who speak English as a second language usually feel confused when it comes to countable and uncountable nouns. Here is a list of most common uncountable nouns which are mistaken by English learners. Those who are preparing for the IELTS and PTE might also find the list useful as they are commonly used in these tests. Feel free to add to it.
Common Uncountable Nouns
Advice Food Attention Behaviour Countryside Equipment Help Furniture Work
Information Knowledge Pollution Research Software Stuff Transport Evidence
Happy Learning :)
Thank you for your contribution Herbert.
Notice that 'people' is not uncountable. People is the plural form of 'person', so it is countable. As it does not follow the usual pattern of adding plural 's', it is confusing for English learners.
Thank you for your useful piece of advice. I appreciate your contribution.
There are lots of nouns like this. When an uncountable is used as a countable noun, it is usually because you are talking about distinct examples, such as types/kinds of.