How to buy RVN?

Could you please elaborate on the steps involved in purchasing RVN, a popular cryptocurrency? I'm new to the crypto market and am looking for a straightforward guide. Could you first advise on selecting a reliable exchange platform that supports RVN? Next, would you kindly outline the registration and account setup process on such an exchange? Also, what are the payment methods typically accepted for RVN purchases? Additionally, could you explain the process of placing a buy order, including the importance of market orders and limit orders? Finally, are there any security measures I should take after purchasing RVN to ensure the safety of my investment? Thank you for your assistance.