How can I buy Internet Computer?

Could you please elaborate on the steps involved in purchasing Internet Computer? I'm particularly interested in understanding the process from scratch, including the platforms or exchanges I should use, any necessary prerequisites or account setups, and any safety measures I should take to ensure a secure transaction. Additionally, I'd like to know if there are any specific considerations or recommendations you have for someone who is new to investing in cryptocurrencies like Internet Computer. Thank you for your assistance.