Pros: Kat snowballs very rapidly and usually can kill bot lane add very easily. with her E she can escape and jump to wards so ward placement is crucial. Kat's R can be activated in a bush and will not reveal your location but the enemy champ will lose health. She is very adept in killing weaker champions so pay attention to cool downs.

Cons: She's frail and cannot take any damage really. She also is easily shut down with cc. Her R's channel is cancelled very easily so wait to use it.

Your Q is very helpful in controlling the lane. Because she doesn't use mana or energy you can use abilities frugally and now worry about mana consumption. E is very good for gap closing and it increases armor for a short period which is great for escapes. Your R can be used to engage or to deter an enemy engage so save it and use it wisely.

late game if you have farmed and gotten some kills its easy to snowball. Map awareness is crucial, your lane no longer matter the only purpose of your existence is to get kills. Roam the map and pay attention to enemy champs so you can find isolated ones and capitalize off of their mistakes and make them pay.

Kat is destroyed in team fights is she is focused, do not allow the enemy team to focus you. What you want to do is wait for a tank to engage and be focused then E on to a weak carry championa and use all of your abilities on them. Kats cool downs reset on kills so each kill leads to the next making multi kills and killing sprees simple. Her best combo is QEWR in that order usually with ignite is a guaranteed kill. Make sure you're the last one in and the last one to leave every fight. Kill stealing is allowed because a fed katarina is nearly impossible to stop