Most nouns add -s. Some are irregular, and uncountable nouns (information, advice, furniture) have no plural and take "much", not "many".
Wrong → right
Common mistake
Corrected
two childs
two children
many informations
much information
I have many informations.
I have a lot of information.
She gave me three advices.
She gave me three pieces of advice.
The equipments are new.
The equipment is new.
Two womans arrived.
Two women arrived.
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