
Hyunjeong O. answered 04/30/19
Native Korean Speaker who loves to teach Korean!
You can use "짱" in most cases.
You can think about "짱" as "top of something" or "awesome".
For example, you can say "너 짱이야!" ( You are amazing!), "너 요리 짱이다!" (You are amazing cook!)
However, "짱" is pretty old thing so most of Young Koreans don't use this anymore.
Hope this is helpful! :)