Early, Soon, Quickly, Fast
adverb
This is the adverb version of the kanji early. It's a little thing you can begin sentences with to say you're doing something early or quickly.
はやく
Since you already know the reading of the vocab word 早い, you should be able to read this word as well.
平日は早く会社に行きます。
I go to work early on weekdays.
三日も早くメールが来た。
I got an email three days earlier.
ゆっくり休んで早くよくなってください。
Please get plenty of rest and feel better soon.