How can I purchase AVAX?

Could you kindly elaborate on the process of acquiring AVAX? I'm interested in adding it to my portfolio, but I'm unsure of the steps involved. Could you guide me through the necessary procedures, including choosing a reliable exchange, setting up an account, funding it, and ultimately executing the purchase? Additionally, are there any specific considerations or safety measures I should take into account while making this transaction? Thank you for your assistance in this matter.