When we talk about how we do actions, we use adverbs of manner. We can also compare the actions using comparative adverbs or (not) as ... as.
I sing beautifully.
My sister swims faster than me.
My friends sail less badly than me.
I don't play cricket as well as my brother.
*Note: Remember that to form adverbs in English, we normally add -ly to the adjective, as in: bad - badly.
But there are some spelling rules that we must remember:
Slow - Slowly Terrible - Terribly Angry - Angrily