Kindred beginner questions

Hello everyone! I've decided to choose Kindred as OTP since I want to gradually increase my rank in solo q. Now I'm at bronze, I'm playing LOL for 6 months (ish). There is a lot of information about Kindred here and on YouTube, but I don't quite understand where I should start with. If you don't mind spending a little of your time, please help me with these questions:

  1. What should a beginner player pay attention to on Kidred in jungle?

  2. I've heard that it's really difficult to play properly on Kindred at higher ranks, enemies play around your marks, invade your jungle early etc. Is this true or very subjective opinion? Maybe there are more effective heroes for higher elo and it's just not worth wasting time on Kindred?

  3. How to use her R properly? Be selfish or use it for saving teammates as well?

  4. What is the best skin for Kindred and why :)

I would be very grateful to everyone for help!