General categories:
* Substances: water, air, sand, wood, rice, gold
* Concepts: information, knowledge, advice, happiness, music, time
* Collections: furniture, luggage, equipment, clothing, jewelry
* Activities: homework, work, research, shopping, swimming
Specific examples:
* Food: bread, cheese, pasta, coffee, tea, soup
* Materials: paper, cotton, metal, glass, plastic
* Weather: rain, snow, sunshine, wind
* Other: news, traffic, progress, scenery
Important Points:
* No plural forms: These nouns don't typically have a plural form (you don't say "two waters" or "many advices").
* Use with "much" or "little": We use "much" or "little" to quantify them, not "many" or "few". Example: "There is much traffic today."
* Can be countable in some cases: Sometimes, these nouns become countable when they refer to specific types or quantities. Example: "He drank three coffees."
Let me know if you'd like to see more examples or need further clarification!