What is an adverb?
An adverb is simply a word that describes a verb (an action or a doing word).
• He ate his breakfast quickly.
The word 'quickly' is an adverb as it tells us how he ate (the verb) his breakfast.
Where to place adverbs?
Adverbs can come before or after a verb.
• He 'quickly' ate his lunch.
• He ate his lunch 'quickly'.