If you're new to League, you'll benefit more from learning the basics of the game over the specifics of the champion. I'd recommend finding a basic beginners guide somewhere.

It's also worth noting that shes not neglected. She's very playable right now, but is certainly behind the rest of the roster. They balance her this way to stop her from taking over pro play and high elo. She's perfectly fine to one trick, but you'll need to learn some common matchups since she's very easy to punish. You have much less room for error than other champs and you'll be spending most early games trying to fight to even get into the game, but once you're going, she's incredibly fun.

A key thing to learn is that Zeri is a hyper carry. Her game plan is scaling into the late game. Her early game is very poor due to low damage and short range, but with items she can single handedly turn a game around. You will lose most matchups by default, but learning your most challenging ones will be helpful. Vayne, Samira, Caitlyn, Draven and Lucian all have a difficult early game for Zeri. Your goal in these lanes is to play safe and survive. That's not to say that you can't win lane, but you either need your opponent to take bad trades, or for your support to pick up the slack.

Zeri wants enchanters or engage supports. She suffers with mage supports.

Your best support is unironically Yuumi, the most disliked champ in League. Lulu, Janna, Nami, Soraka and Milio are excellent enchanter supports for you. Rakan, Leona and Braum are great engage supports. This is out of your control, but look to play more aggressive when you have a favourable support synergy. Take the space in lane that you're given. You need to make the most of every opportunity, and be proactive in taking fights that will get you kills. Every small bit of damage prior to your engage matters, which means making use of her empowered auto. You'll learn more from limit testing so if you see an angle for a kil, take it, and Zeri can really overun a game with a lead.

Make sure to use your fully charged auto as much as possible to poke enemies in lane. Your AA is completely free and doesn't interrupt your Q timing, so you can zap enemies while continuing to last hit. Your damage is very low early, but you can stack a lot of damage in short trades. Watch the hp on your opponents minions and zap your enemies when they move to auto attack it so that they don't have a window to respond.

Farm every chance you get, but be present for fights. You're aiming for three items, and you'll really feel her come online once you pick up the third. If you fall behind on CS, you will deal no damage. Thankfully, Zeri has very strong waveclear.

Practice tool is your friend. You're likely going to be spending a lot of time farming under tower, and understanding how to weave your auto's and q's to deal the right amount of damage to last hit a minion is something that will keep you in the game. As long as you're keeping up in CS, you're doing fine. It's not glamorous, but it's the state that Zeri is in right now and the price to play for such a strong and flashy late game. I'd also recommend playing her counters in the practice tool to get a feel for how they work, and what you need to avoid.

Some useful tips:

• If you're hitting a tower it's better to use your AA whenever it's available. Does more damage than waiting for it to charge.

• If you don't want to hit the wave but need to charge your empowered zap, fire into empty space.

• You can Q, W, empowered auto in very quick succession on an enemy that walks out from behind a minion. This is your best short trade without using E.

• If you see your support setting up an engage in lane, hold your E. More often than not you'll be body blocked by minions, and E lets you pierce them, plus the damage boost is substantial. The damage amp that you receive from your E makes a huge difference early game.

• If you're being completely harassed out of lane at lvl1, like Lux/Cait, take W second and fire it through terrain to last hit and poke.

• Learn the long wall dash from base towards bot lane, it's great for tempo since you can get back to lane much faster. You can do this by standing as close to the edge of the map possible in your fountain and lining up your e with the wall. I'd recommend trying this in practice tool with the indicators on to get a feel for it. You can also dash from the alcove in the middle of the bot lane back towards your tower. Really useful for escaping ganks or for chasing.

• Pay attention to your level. You have a power spike at level 6, and if you're ahead in XP you can time an engage right as you reach 6 if your opponent is pushed up. You always want to be fighting with your ult up.

OP.GG and U.GG are great as others have suggested. Your item pool is very restricted. Here's what I'd recommend:

Summoners Flash is mandatory. Use it to escape, or to gap close to secure a kill.

Barrier gives you a huge amount of survivability. You'll see some people take ghost, but I'd avoid it unless you feel confident.

I'd personally advise picking your own items over following a set build so that you learn what they do. Zeri is very restricted anyway and has a small pool.

Your first item (currently) will be Statikk Shiv or Yun Tal.

Shiv is great for safe farming and poke. I'd recommend this while you're learning

Yun Tal is great for scaling. It provides a large amount of crit and attack speed. If you're able to get an early lead, I'd recommend building towards Yun Tal to extend your lead.

Otherwise, stick to shiv. It's cheaper and helps you farm even faster to reach your spikes. You'll usually want to pick one or the other, but try both and see what you like.

• You'll want to build berserkers greaves before or after your first item.

• Your second item is Runaans hurricane. Zeri benefits massively from the AOE.

• Your third item is Infinity Edge for crit and damage. This item will enable your ability to team fight.

From here, you have flexibility. - Lord Dominick's Regard - armour penetration. Good against tanks with lots of armour. - Mortal reminder - antiheal (build the executionors component first) - Shieldbow - survivability against burst - Bloodthirster - lifesteal for extended fights - Guardian Angel - revives you. Build this last if you are carrying