How do I buy and sell crypto?

For those new to the world of cryptocurrency, the process of buying and selling crypto can be somewhat daunting. Could you provide a brief overview of the steps involved in purchasing and disposing of digital currencies? Specifically, I'm interested in knowing how to set up a cryptocurrency wallet, choose an exchange platform, make a purchase, and then later on, how to sell my crypto holdings securely? Additionally, could you also touch upon the importance of conducting thorough research, understanding market fluctuations, and protecting my digital assets from potential risks? Thank you for your assistance in navigating this exciting yet complex financial landscape.