Your Passive is important for the shield and the Mana.

Go out of your ally with our W, Auto Attack an enemy champion and go in your ally as fast as u can.

Like this, you can get your shield and Mana really fast and stay safe most of the time. Be especially careful when the enemy champion has cc. It can reset the cool down on your W and you will be an easy target for your enemies.

While you are on the lane with your ADC, sit on him with your W and poke the enemies with your Q.

Don't hit the minions and try to guide the projectile on the longest way possible to the enemy. When the Q flies for over a second, it will deal more damage and slows the enemy.

The slow is important when you and the ally you are sitting on are chasing someone. You will make it easier for your ally to reach the enemy, when you slow them.

IMPORTANT: It's okay to miss the Q - you can't hit every single Q. Stay calm and try to hit the next one. :D

When you sit on an ally with your W you are unable to get targeted by anything except towers. When you and your team dive someone under a tower, pay attention if you got targeted or not. If you did, you should go away from the tower as fast as possible, you can't take many shots until you will die.

But remember: The tower will only attack you when you are the first one hitting an enemy, if some ally hit the enemy before and gets the tower shots are you safe.

The most important thing about the W is that the cool down will reset if you get hit by any cc (Stuns, Roots, Air bone, ...). This is really dangerous: Yuumi gets killed really easily, when she is targetable - so be careful!

This spell has healing and a small movement speed buff.

The healing will get really strong with this build in the end, but at the start of the match you need to be careful: It costs a lot of Mana (try to get Mana back with your Passive), it's not really much and the cool down is really high.

So don't heal your ally when there are only a few HP missing, wait until the right moment to use it. Like when you see the enemy Jungler to help your ally escape with the extra movement speed he gains.

The movement speed is important too, when you are chasing an enemy.

In the late-game your healing will be able to heal allies completely with only casting it 2-4 times, what makes your allies mostly immortal.

When more than one ally needs your healing, try to figure out who needs it more (Who has less health? Who has the most shut down? Who is more important for your team? Who is the one who can carry you?)

This spell does not do that much damage, but the root is important.

While being on the lane: Look when your ADC is ready to engage on the enemy or when your Jungler / Midlaner is coming. Figure out the right direction and the right moment - you will find them when you practise.

In teamfights your Ult is important too. When you hit many enemies, it will be a lot easier for your team to kill them and win the fight.

Remember: You can cast your E while your R is active, but not your Q. You can leave or sit on allies with your W while casting.

IMPORTANT: Not every Ult will root the enemy, not every Ult will hit - and that's okay. Just stay calm and try to hit the next one - you can do this. :D

Look on your team: Look when they need you and try to get there - but be careful where you go, you are a really easy target when you are alone. So try to go with one of your allies. Don't go when you think it might be too dangerous.

Try to stay with at least one of your team mates - don't go spilt push or anything like that. You are important for your team in team fights - stay with them.

When your allies die, go to a safe place and wait there for someone to come and pick you up or recall. When another ally is nearby and you can reach them safely - go to them.

When you are being chased try to get to the closest ally who will probably not die when your chasers arrive. Ping them for help too - maybe they will come to pick you up.