There are a few ways to use adverbs.
You can often (not always) recognize adverbs by the ending -ly.
1. An adverb can describe a verb. -> He sings loudly.
2. An adverb can describe an adjective. -> The dog is very brave.
3. An adverb can describe another adverb.
-> He never does his chores too quickly.
4. An adverb can describe sentence. -> Sadly, it was too late.