Jayce is free..

His combo is this:

[Cannon stance] W auto 3x, E+Q, R [Hammer stance] Q auto, W, auto, E to disengage, R [cannon stance] use speed boost to create distance/avoid collision with minion wave

Trinity Force is a strong item for jayce

Farm till you have just enough for Tear then go back and get it asap. Spam abilities conservatively in lane to stack it quick. Max Q>W>E. Your trade-winning combo is W (in cannon mode, don't attack) R > Q > W (mid flight) > 3 Autos > E then walk away > R > E > Q.

Yes, first item you want to buy is Tear. While it stacks I usually build BOTRK and brutalizer. When your Tear is highly stacked finish it to Manamune and once you hit 750 stacks it will upgrade to Muramana... You will be OP. Once blade and muramana is built you wanna finish your Yomuu. After those 3 essential items I usually build depending on the other team. (Trinity is a pretty good 4th item) Build cooldown reduction boots.

• You want to max your Q and then your E, the combo of those 2 [Canon stance] hits hard.
• When you're being chased you want push back the enemy with your E [Hammer stance] and then use the mouvement speed from your E [Canon stance]
• Early game, poke the enemy as much as possible with your W [Canon stance].

I might have forgotten some tips I usually use when I play him. Have fun playing Jayce !

Situational Item (GA works well)

he beats garen enough said.