What is the basic definition of a prepositional phrase?

A word chunk that begins with a preposition.

According to the video, what are the three ways prepositional phrases can be used?

As nouns, adverbs, and adjectives

The bird flew swiftly through the trees. (Here, 'through the trees' modifies the verb 'flew.')

The book on the shelf is mine. (Here, 'on the shelf' modifies the noun 'book.')

I can identify and use prepositional phrases to add detail to my writing.

1
A prepositional phrase begins with a preposition and can function as an adverb or adjective.
2
In the phrase 'with the strength of a giant,' the sub-phrase 'of a giant' modifies the noun strength, acting as an adjective.
3
Prepositional phrases can sometimes cause ambiguity, so writers should be careful to avoid confusion.