(Help) Jungle Learning?

Hello! I'm a hardstuck silver player that has been trying to climb for a while.. and i want to learn how to play the jungle role. But i got almost 0 information about it. Like: when to invade. How to walk in the jg. when to gank/counter gank and everything about the role. So i need your suggestions about how to play the role from the bottom and which champs i could start with. Thanks :)
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