Where can I buy arbitrum?

I'm interested in purchasing Arbitrum, but I'm not quite sure where to start. Could you please advise me on the platforms or exchanges where I can securely and conveniently buy Arbitrum? I'm also curious about the trading fees and the overall user experience on these platforms. Additionally, would you recommend any specific safety measures or considerations I should take when making such a purchase? It would be great if you could provide some insights on this matter.