Diamond player I need tips on how to jungle

Im quitting toplane since its not safe for my mental health as someone who plays immobile champions. I thought jungle was most similar to toplane so Im giving it a shot. Any tips, for example, which lanes do I give most of my attention to? When do I invade? Etc Whenever I was autofilled id play champions like Ammumu or Kayn (mostly Rhaast) Thanks.
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