As we all know Shaco is a great assassin so its very easy to get a kill.In this guide I am showing you the build i use for shaco

Well the first basic item is of course dorans blade to gain extra attack damage that help you take the first blood thing that is very easy when you have Shaco.Second item is boots of speed which is basic.I choose to take 3 potions so i don't have to recall all the time so I can farm more or to help me be saved from an opponent's ignite when I have low life.Then phantom dancer that is basic in ad(attack damage) builds and black cleaver to earn some attack speed.Bloodthister is very good and helps a lot when you have to fight 1 vs 1.Then an infinity edge is very important to earn more ad and ofc to make your criticals deal more damage.Finally i choose frozen mallet to give me some life and slow my opponents if they try to escape or I can buy a second phantom dancer .

Your best ability when playing Shaco is your 1st one which is very usefull when escaping and very good to pick up a kill.So you throw a jax in the box first then you go behind the enemy with your 1st and hit him(Shaco's passive gives him extra 20% ad when hitting from behind) and then if he is trying to go use your third attack to finish him.(ofc if you see you are loosing use your third before to deal some damage)
Finally your ulti.Shaco uses his ulti to comfuse his opponents or kill him.
For example when escaping can use ulti send his clone somewhere(by cliking alt or using again r) and use his first one in an other direction).Or your ulti can deal multiple damage (600+ap in lvl 3) +clones basic attacks that is equal to your 75% ad

Some good spells for Shaco is ignite and ofc flash.But because of his 1st ability you may want to try using exhaust or even teleport.
Exhaust: "stunning" the enemy for some seconds giving you the chance to deal some true damage or helping you escape.
Teleport: Help you get somewhere fast (in early game to xp faster and in late to help your teamates)

Shaco is a very good champ you better try playing with him one or two times to know him better before you judge him.He is very easy to play and kill if you know how to play.Thank you for reading my guide plz reply and send me your idies and vote as you wish
(For more info send me pm i will be clad to help you)