How do I buy or sell bitcoin?

Good day, fellow investor. I'm here to inquire about the process of buying and selling bitcoin. Could you please elaborate on the steps involved in acquiring this digital currency? I'm particularly interested in understanding the various platforms or exchanges that facilitate these transactions. Additionally, I'd like to know about the necessary requirements, such as setting up a digital wallet and ensuring the security of my transactions. Could you also provide some insight into the factors that influence the price of bitcoin, such as market demand and supply? Lastly, I'm curious about the tax implications and any legal considerations I should be aware of before engaging in Bitcoin trading. Thank you for your assistance in navigating this complex yet exciting world of cryptocurrency.