Overview
If you don't know about Zhask then don't read this.
Strengths
The key strength for me is timing his 2nd spell. In both ult and regular state. Stun with your 1 skill and 2nd skill combo and with a help of a dmg dealer teammate and you can get a lot of kills of. I also use FS to finish off enemies. Go wishing lantern for tanky heroes.
Weaknesses
Positioning of your ult and the follow-up first spell to reposition. You don't have any escape skills so if you position to initiate then have an idea for backing off. Keep and eye on the ult time and don't overstay.
Zhask
I'd say divine and lantern are situational. Take winter into the added items build.
Zhask
Burst and mana
Battle Spell
Use it to finish off and also push back basic hitters. Try to predict where they are gonna hide to recall to base.
Early game
Gank and pressure lanes after getting to lv 4. You can help secure early turtles by kiting enemies away with ult.
Best With Clint
Because of the first skill second skill stun and finish off combo
Watch Out For Xavier
Xavier will outpoke you to death.