Hi everyone and welcome to this guide.
Today, I'll teach you how to make your enemies cry like a bunch of wimps.
But before we jump into action, let's get and idea of what kind of champion Shaco is.
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Pros

Strong ganks
Awesome at counter-jungling
Guaranteed crits
High burst
Amazing jukes
Pusnishes running enemies
Little slaves who will jungle for you

Cons

Squishy
No hard CC (just a slow and a short fear)
Not nearly as strong when behind
Weak teamfights

You actually want to read an explination about Shaco's abilities?
I didn't post the Champion Spotlight for no reason, watch that instead and train your ears instead of your eyes!
~Lee Sin

Blue buff
Put boxes behind the big golem, to make sure they don't attack the small ****ers. Also make sure the golem attacks your boxes, not you.

Gromp
Just put a box behind him or something.

Wolves
Stand in the gap behind the wolves. Then put a box in the face of the big wolf. Now the big wolf will attack your baby shaco and the baby wolves will attack you.

Raptors (chickens)
I honestly don't know, that's why I almost never do them without the purple smite.

Red buff
Same with blue buff

Crugs (mini golems)
Never do them.

Dragon

Easy solo as long as you have your ult. Let your clone tank while you do backstabs.

Gank

Gank and push

Splitpush

Ganking

Jump over walls with your Q, the bush is probably warded
When a gank failed, press your Q imideatly as soon as you enter a bush for another gank >:D
Try to attack from behind for bonus damage from your passive
Use your E as late as possible to keep slowing the enemy withauto attacks
If your a little low on hp, putting a box somewhere might help, as it may prevent enemies from escaping and attacking.

Juking and escaping

Use your Q the opposite way you're running.
Jump over walls with your Q.
Dodge for example Karthus's ult by ulting at the exact time it will deal damage. By this I mean you need to make sure his ult will detonate the moment between you activating your ult and your clone spawning.
You can even jump really small walls with your ult. What you want to do is stand next to the wall and then ult. While you're invisible, you need to spam rightclick over the wall. If done corectly, you're now at the other side of the wall. (your clone won't be)

Counter-jungling

Put boxes on the paths where the enemy jungler will walk, so that you can keep track of them or set up a kill.
When you see the enemy jungler going back into their jungle with low hp, kill them!!!
If you want to get first blood at lvl 2 on the enemy's 2nd buff, take W and then Q. Put a ward in the bush that touches the red buff to see when the jungler arrives. Put a box in the middle of the path to the krugs, and one in the bush near the raptors (that is if you're team blue). When the jungler is getting low, simply walk to them. If they try to run away, the boxes will stop them, otherwise try Q + ignite.

Splitpushing

Don't start splitpushing until you have your tiamat. You can then make small splitpushes. After you get your statikk shiv, you can make some real plays.
I recommend using your ult to take down your **** faster.
When doing an inhib, try to predict how your enemy will stop you by placing a box at that side (boxes don't attack inhibitors)

Shaco might be hard, but keep at it and carry your games.
Perma-camp important lanes to make them feed and ragequit.
Never teamfight, it's SOLO queue for a reason.
If you lose, blame your teammates for not being able to win a 4v3 (if you got really fed your enemies will usually send 2 enemies after you)