Some nouns are used only as a singular

This category of nouns includes irregular words that have no plural forms. We use them only as singular even if the context or the meaning conveyed seems to be plural.
No need to add suffixes such as -s or -es at the end of the root word in these examples:
Luggage, Furniture, Information,

Poetry, Machinery, Advice, etc.

Let’s practice!

Before, you can get information mostly from books; but today you can get it from the internet as well as other resources.
I have some information about your missing dog.
‘May I ask your advice about something?’
The apartment was cluttered with lots of furniture.
The bellman collected their luggage and had it loaded in the car.