I Learned to Play Shen in 24 Hours

Position your Passive Sword BEHIND the enemy as soon as possible (This will be in the video) so that way if they walk up to CS you can use your Q and get a good trade.

Don't ALWAYS ult. If your wave is at your tower DON'T ULT unless its a big fight. If you ult away your opponent will get 2-5 plates (depending on how far into the game it is) and a LOT of CS and you will fall behind. Usually its not smart unless its an early 4v4.

HOWEVER, if the wave is in the middle of the lane, you pushed the wave, OR the opponent just backed you can Ult pretty easily.

Play aggro early you have one of the strongest level 1s in the game for short trades and then when you hit 2 you can go all in with ignite. You don't ebe EVERYONE but like 70-75% of top laners you can beat. And if you are low elo and people trade BADLY you can probably beat even more