nothing
The Italian word 'niente' translates to 'nothing' in English. It is used in pretty much the same way as in English, to express the absence of something. It can be used in negative sentences, and before adjectives and nouns. Example: 'Non so niente' translates as 'I know nothing'.
There is nothing to eat
This sentence is used when there's no food available or nothing you want to eat. 'Non c'è' translates to 'there is not', and 'da mangiare' means 'to eat', so 'niente da mangiare' means 'nothing to eat'.
Nothing is impossible
Similar to the English phrase, 'Niente è impossibile' is an expression of optimism and determination in the face of challenges. 'è' is the third person singular present of the verb 'to be', and 'impossibile' is the adjective for 'impossible'.
No fear!
This is a common phrase used to reassure someone who is afraid or nervous. Note that 'paura' means 'fear', so 'Niente paura!' translates directly to 'No fear!'.