These are commom adjectives + prepositions collocations:

1. + by

confused by

impressed by

surrounded by...

These are common English collocations: verbs + prepositions

1. + about

boast about

decide about

dream about

protest about

reminisce about...

English collocations: prepositions with word phrases

At

at a cost

at a discount

at a distance...

An antonym is a word which means the opposite of another word. Antonyms are also called opposites. Synonyms and antonyms are useful to know because they improve reading and writing skills. By learning antonyms, you learn the logical opposites of important words, thus enhancing your overall command of language.