How to buy roostcoin?

Excuse me, could you please explain the process of purchasing Roostcoin in detail? I'm quite new to the world of cryptocurrency and would appreciate a step-by-step guide on how to go about it. Is there a specific exchange or platform that I should use? Additionally, what are the necessary steps to ensure the safety of my investment and transaction? Any tips or precautions I should be aware of before diving in? Thank you in advance for your assistance.