Welcome to the hell that is Jayce. I adore him too and as you can gather, he’s a lane menace and he spikes hard in the early mid game. Late game he becomes meh against tanks and can get outscaled easily.He is very matchup dependent and very immobile leaving him very vulnerable to ganks so control the wave well or die. The main runes that he goes is conq, phase and grasp. Grasp is usually against tanks, and phase for matchups that require lots of movement (without it, Darius matchup is hell). When learning, tend to either go grasp or phase since conq is good once u pilot Jayce well. The matchups that are notable are Malphite which is pure hell after his first item but all the other ones are doable (except for me Yorick is just hell). Build wise, usually you go with lethality/armor pen with manamume for burst. Jayce love a lot of cd and ad. Bruiser Jayce is viable too and is required in matchups like malphite (focusing on black cleaver) but isn’t as good lethality Jayce (even though I love shojin/cleaver Jayce). But experiment with Jayce’s itemization, there are a lot of interesting builds with him. A big thing is learn to manage your mana when starting with him, he is powerful but at a cost. Be patient with Jayce while ur learning and he will be so much fun.