THE GOOD

- Great solo carry potential, you are the deciding factor of the game
- Can snowball with good roams, Not necessary to always win lane
- Have the power to completely change the tide of a lost game
- One of the best team-fighting champions in the game
- Feels good when you 1v9 a game
- Do not need to CS very well to win

THE BAD

- Takes a long time to master
- Can very easily throw games/get too confident
- Loses almost every matchup in midlane, has to win through other means
- Strives off kills, can be starved to death
- Sometimes your lane is decided by your jungler
Speed of your combos - My Biggest tip for everyone playing Kat is, go to practice tool and focus on the speed of your main combo (e, w, q, r.) The faster you do it the better. Sometimes with Kat even the the most minuscule milliseconds you miss will be the cause of the loss in a teamfight.

Never Give Up From Laning - Do not give up if your lane is going bad, I cannot tell you how many countless times I've won the game regardless of lane situation, Katarina excels at winning teamfights. If one really bad teamfight breaks out for the enemy. you will get fed and snowball.

Watch The Map - Please Look at your map. Most of the time you will get fed off botlane not your opponent midlaner. In challenger you will almost never solo kill your laner, you will either need jungle support or you will have to look for skirmishes. Whenever you can take a look at botlanes HP and look at the state of the lane.

Auto attack Resetting - A neat trick you can do with Katarina is auto e auto on the SAME target, you cannot auto reset with your e on a separate target it HAS to be on the same one. This helps you win early trades in laning phase.

Dagger Function - Your dagger acts as a big circle, and it can be used to e to a certain spot on the circle. By utilising this you can e over small walls by dropping a dagger next to it.

Cheeky Shunpo Usage - You can use shunpo to anything that's allied. This includes Plants, Threshes lantern, Zyra plants, Jarvans' Spear and Teemo mushroom's. You should also look for minions like Yorick ghouls and Elises' spiderlings.
Roaming should be done when you have either:
- Dominated your lane and you need to win other sides of the map for your team
- Your lane opponent is playing too safe for you to get anything done
- Your lane is more or less unwinnable and you need to get fed so you're relevant

WARNING - Never sack too many minions before you roam, make sure the situation is worth roaming to, Look at HP and lane setup before you arrive in botlane. Make sure you shove your wave before you roam, sometimes losing HP for a roam IS worth it.
You Have Two Options:

ONE
The way into a big teamfight as Katarina usually not your normal combo. Either you throw daggers into the enemy off of minions or tanks (this is called fishing q's,) Or you look for a good dagger drop onto carries or into as many as possible. If they have a heavy crowd control composition you will need to buy a Zhonyas. This item is almost ESSENTIAL to heavy cc comps. You play a big role of engaging for your team sometimes and Zhonyas is a must buy. You will jump to your dagger and Zhonyas almost instantly. It will do good damage + give your team the confidence to engage with you. You will no longer be in danger if your team engages and I use this strategy a ridiculous amount and believe me, It works.

TWO
Some teamfights may work differently and you may need your frontline/engage teammates to do most of the work for you. These champions consist of Jarvan/ Zac ETC. Remember, Katarina works off Resetting kills. So play off your engages.

If you'd like more info about it, come by my stream is twitch.tv/youandale leave a follow and ask anything.