Hello i am BenniB9, and this is my Kayle guide.
I main Kayle in the jungle and i have climbed from silver 5 to Gold with him recently.
This is not a very detailed guide, but it contains the most important information about Kayle.

Your main goal is to get Sated Devourer as soon as possible, because that is were most of your damadge comes from. Focus farm, and gank when you see a secure kill. Drakes is very important to get because it gives you 5 stacks in your Devourer jungle item. If you get 30 stacks you get Sated Devourer. Normal big monsters such as golem, wolf, red etc. gives you one stack. River crab gives you 2 stacks, and epic monsters (drake/ baron) gives you 5 stacks.
In teamfights your task is to do as much damadge to enemy team as possible, focus ADC and APC. And you should also heal and use ult on your team. Its often smart to save your adc, but it depends on the situation.